Re: Stus-List Interesting electrical problem

[John Christopher via CnC-List]

I googled “load dump”... got an image of guy sitting on the head ;).


/John

> On Sep 27, 2019, at 3:08 AM, Matti Airas  wrote:
> 
> Hi,
> 
> I'd check the battery and alternator connections carefully. And the main 
> switches, too. If the batteries get disconnected while the motor is on, the 
> alternator will create a load dump that can be even over 100V for a fraction 
> of a second. In principle, automotive and marine electronics should be 
> protected from that but you never know. I'm only speculating, but if that was 
> the reason, maybe the voltage spike was short enough that the fuses didn't 
> have time to heat up?
> 
> Google for "load dump" if you want to learn more.
> 
> Cheers,
> 
> Matti Airas
> C 36 "Hurma"
> Helsinki, Finland
> 
> 
>> On Thu, 26 Sep 2019 at 22:26, Ian Matthew via CnC-List 
>>  wrote:
>> I have been following the list for many years and I enjoy reading the wisdom 
>> of this group.  I have an interesting problem and seek your advice.
>> 
>> I have an very intermittent electrical problem (in fact it has only happened 
>> twice in the last 7 years.  In both cases it has resulted in electrical / 
>> electronic components becoming 'blown out' with all fuses inline remaining 
>> good.
>> 
>> The first time I suddenly lost my AM/FM radio and ALL my navigation lights. 
>> The engine also stopped as I had no power to drive the electric fuel pump. 
>> This happened when motoring back home at night after a long race.  
>> Fortunately there was wind and a hand-held VHF and a powerful spotlight on 
>> the sails allowed us to be seen by commercial traffic.  Afterwards, I 
>> checked - ALL the incandescent bulbs that were on had blown, but the fuses 
>> were OK.  The radio had internal circuit board components blown but again 
>> the inline fuses (there are 2) were OK.  In the case of the fuel pump, this 
>> had to be replaced.
>> Thinking this may have been a spike from the alternator, I replaced the 
>> alternator.
>> 
>> Last week (3 years later), motoring back in the dark I had a similar 
>> problem, but this time only my VHF radio 'blew'.  Again the inline fuse was 
>> good.  The navigation lights have been replaced with LED lights and the 
>> AM/FM radio was off.
>> 
>> I often motor after long races and this has only happened twice!
>> 
>> Does anyone have any ideas as to what may have caused this.  I am an 
>> engineer so can diagnose most things but this has baffled me.
>> 
>> I am about to upgrade my VHF radio for one with DSC and internal GPS and to 
>> add some wind instruments.  (I have a Raymarine knotmeter/depth meter 
>> combined, and a EV-100 autopilot.)  I want to separate my electronics 
>> electrical input and have considered putting them on an isolated battery, 
>> but charging is a problem.  Is there some circuit protector I can put in 
>> place to stop this happening again?
>> 
>> All suggestions welcomed.
>> 
>> BTW - for those of you with 29 mk 1's - you can race them competitively in 
>> strong winds (as is usual on San Francisco Bay) - keep the boat flat and 
>> have a really good crew!
>> 
>> 
>> -- 
>> Ian Matthew
>> "Siento el Viento"  C 29-1
>> San Francisco Bay
>> ___
>> 
>> Thanks everyone for supporting this list with your contributions.  Each and 
>> every one is greatly appreciated.  If you want to support the list - use 
>> PayPal to send contribution --   https://www.paypal.me/stumurray
>> 
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Re: Stus-List Interesting electrical problem

[Dreuge via CnC-List]

Hi,

I agree, this sounds like a large voltage spike.  As noted, a direct lightning 
strike (and even an EMP from close strike) can wreak havoc on electronic 
without either being turned on or blowing the fuse.   Since, there was no 
mention of weather, I agree with those suggesting an alternator spike.  

It is possible to be an intermittent fault within the alternator, but given the 
marine environment, it’s more likely a connection problem, either positive or 
negative.   Don’t over look a bad negative connection.   An alternator can have 
a good ground connection but have a bad negative terminal connection.  This is 
why companies like Balmar recommend a dedicated negative cable, same size as 
the positive cable, connecting the alternator to the negative terminal.   

That said, I knew of a person who tried to make things better by installing a 
dedicated negative cable. Things worked well for a long time until he upgraded 
his alternator to a high end brand.   He was really pissed when he found out 
that his new system would only charge his house battery and not his start 
battery.  He originally had a working system, and the thought was that the new 
alternator somehow messed with his battery isolator by damaging it or just 
keeping it from working.  The problem turned out to be a bad connection between 
the negative terminals of the house and start batteries (maybe they got 
disconnected and forgotten).  The new alternator had an isolated ground whereas 
the old one did not.  The old alternator system worked because the two 
batteries' negative terminals were connected through the dedicated negative 
cable to alternator to engine to start battery negative.  With the new isolated 
alternator, the alternator negative was only connected to the house negative 
terminal.


-
Paul E.
1981 C Landfall 38 
S/V Johanna Rose
Fort Walton Beach, FL

http://svjohannarose.blogspot.com/

> On Sep 27, 2019, at 8:11 AM, cnc-list-requ...@cnc-list.com wrote:
> 
> Message: 3
> Date: Fri, 27 Sep 2019 10:08:18 +0300
> From: Matti Airas mailto:mai...@iki.fi>>
> To: cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com>
> Subject: Re: Stus-List Interesting electrical problem
> Message-ID:
><mailto:cahfg+fn-gl0unp8mrnbrep+nsjrprhkfkly1jrv_7zzxbpd...@mail.gmail.com>>
> Content-Type: text/plain; charset="utf-8"
> 
> Hi,
> 
> I'd check the battery and alternator connections carefully. And the main
> switches, too. If the batteries get disconnected while the motor is on, the
> alternator will create a load dump that can be even over 100V for a
> fraction of a second. In principle, automotive and marine electronics
> should be protected from that but you never know. I'm only speculating, but
> if that was the reason, maybe the voltage spike was short enough that the
> fuses didn't have time to heat up?
> 
> Google for "load dump" if you want to learn more.
> 
> Cheers,
> 
> Matti Airas
> C 36 "Hurma"
> Helsinki, Finland

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Re: Stus-List Interesting electrical problem

[David Knecht via CnC-List]

I had not heard that the Starfleet had developed the technology to detect 
cloaked vessels.  Dave

S/V Aries
1990 C 34+
New London, CT



> On Sep 27, 2019, at 10:22 AM, Edd Schillay via CnC-List 
>  wrote:
> 
> Short-range scan complete. No aliens. 
> 
> All the best, 
> 
> Edd
> 
> ———-
> Edd M. Schillay
> Captain of the “Starship Enterprise”
> C 37+ | Sail No.: NCC-1701-B
> Venice Yacht Club | Venice, FL
> www.StarshipSailing.com
> ———-
> 914.774.9767   | Mobile
> ———-
> Sent via iPhone X
> iPhone. iTypos. iApologize
> 
> 
>> On Sep 27, 2019, at 10:06 AM, Don Kern via CnC-List  
>> wrote:
>> 
> 
> 
> It is a Left coast boat, thus aliens
> 
> 
> 
> On 9/26/2019 11:57 PM, Jim Watts via CnC-List wrote:
>> Sounds very much like a lightning strike. I assume you'd know if you'd been 
>> hit.
>> Or aliens. 
>> 
>> Jim Watts
>> Paradigm Shift
>> C 35 Mk III
>> Victoria, BC
>> 
>> 
>> On Thu, 26 Sep 2019 at 14:16, John Irvin via CnC-List > > wrote:
>> Any UFO’s in the area?
>> 
>> Sent from my iPhone
>> 
>> > On Sep 26, 2019, at 3:26 PM, Ian Matthew via CnC-List 
>> > mailto:cnc-list@cnc-list.com>> wrote:
>> > 
>> > I have been following the list for many years and I enjoy reading the 
>> > wisdom of this group.  I have an interesting problem and seek your advice.
>> > 
>> > I have an very intermittent electrical problem (in fact it has only 
>> > happened twice in the last 7 years.  In both cases it has resulted in 
>> > electrical / electronic components becoming 'blown out' with all fuses 
>> > inline remaining good.
>> > 
>> > The first time I suddenly lost my AM/FM radio and ALL my navigation 
>> > lights. The engine also stopped as I had no power to drive the electric 
>> > fuel pump. This happened when motoring back home at night after a long 
>> > race.  Fortunately there was wind and a hand-held VHF and a powerful 
>> > spotlight on the sails allowed us to be seen by commercial traffic.  
>> > Afterwards, I checked - ALL the incandescent bulbs that were on had blown, 
>> > but the fuses were OK.  The radio had internal circuit board components 
>> > blown but again the inline fuses (there are 2) were OK.  In the case of 
>> > the fuel pump, this had to be replaced.
>> > Thinking this may have been a spike from the alternator, I replaced the 
>> > alternator.
>> > 
>> > Last week (3 years later), motoring back in the dark I had a similar 
>> > problem, but this time only my VHF radio 'blew'.  Again the inline fuse 
>> > was good.  The navigation lights have been replaced with LED lights and 
>> > the AM/FM radio was off.
>> > 
>> > I often motor after long races and this has only happened twice!
>> > 
>> > Does anyone have any ideas as to what may have caused this.  I am an 
>> > engineer so can diagnose most things but this has baffled me.
>> > 
>> > I am about to upgrade my VHF radio for one with DSC and internal GPS and 
>> > to add some wind instruments.  (I have a Raymarine knotmeter/depth meter 
>> > combined, and a EV-100 autopilot.)  I want to separate my electronics 
>> > electrical input and have considered putting them on an isolated battery, 
>> > but charging is a problem.  Is there some circuit protector I can put in 
>> > place to stop this happening again?
>> > 
>> > All suggestions welcomed.
>> > 
>> > BTW - for those of you with 29 mk 1's - you can race them competitively in 
>> > strong winds (as is usual on San Francisco Bay) - keep the boat flat and 
>> > have a really good crew!
>> > 
>> > 
>> > -- 
>> > Ian Matthew
>> > "Siento el Viento"  C 29-1
>> > San Francisco Bay
>> > ___
>> > 
>> > Thanks everyone for supporting this list with your contributions.  Each 
>> > and every one is greatly appreciated.  If you want to support the list - 
>> > use PayPal to send contribution --   https://www.paypal.me/stumurray 
>> > 
>> > 
>> ___
>> 
>> Thanks everyone for supporting this list with your contributions.  Each and 
>> every one is greatly appreciated.  If you want to support the list - use 
>> PayPal to send contribution --   https://www.paypal.me/stumurray 
>> 
>> 
>> 
>> 
>> ___
>> 
>> Thanks everyone for supporting this list with your contributions.  Each and 
>> every one is greatly appreciated.  If you want to support the list - use 
>> PayPal to send contribution --   https://www.paypal.me/stumurray 
>> 
>> 
> ___
> 
> Thanks everyone for supporting this list with your contributions.  Each and 
> every one is greatly appreciated.  If you want to support the list - use 
> PayPal to send contribution --   https://www.paypal.me/stumurray
> 
> ___
> 
> Thanks everyone for supporting this list with your 

Re: Stus-List Interesting electrical problem

[Edd Schillay via CnC-List]

Short-range scan complete. No aliens. 

All the best, 

Edd

———-
Edd M. Schillay
Captain of the “Starship Enterprise”
C 37+ | Sail No.: NCC-1701-B
Venice Yacht Club | Venice, FL
www.StarshipSailing.com
———-
914.774.9767   | Mobile
———-
Sent via iPhone X
iPhone. iTypos. iApologize


> On Sep 27, 2019, at 10:06 AM, Don Kern via CnC-List  
> wrote:
> 


It is a Left coast boat, thus aliens



On 9/26/2019 11:57 PM, Jim Watts via CnC-List wrote:
> Sounds very much like a lightning strike. I assume you'd know if you'd been 
> hit.
> Or aliens. 
> 
> Jim Watts
> Paradigm Shift
> C 35 Mk III
> Victoria, BC
> 
> 
> On Thu, 26 Sep 2019 at 14:16, John Irvin via CnC-List  
> wrote:
>> Any UFO’s in the area?
>> 
>> Sent from my iPhone
>> 
>> > On Sep 26, 2019, at 3:26 PM, Ian Matthew via CnC-List 
>> >  wrote:
>> > 
>> > I have been following the list for many years and I enjoy reading the 
>> > wisdom of this group.  I have an interesting problem and seek your advice.
>> > 
>> > I have an very intermittent electrical problem (in fact it has only 
>> > happened twice in the last 7 years.  In both cases it has resulted in 
>> > electrical / electronic components becoming 'blown out' with all fuses 
>> > inline remaining good.
>> > 
>> > The first time I suddenly lost my AM/FM radio and ALL my navigation 
>> > lights. The engine also stopped as I had no power to drive the electric 
>> > fuel pump. This happened when motoring back home at night after a long 
>> > race.  Fortunately there was wind and a hand-held VHF and a powerful 
>> > spotlight on the sails allowed us to be seen by commercial traffic.  
>> > Afterwards, I checked - ALL the incandescent bulbs that were on had blown, 
>> > but the fuses were OK.  The radio had internal circuit board components 
>> > blown but again the inline fuses (there are 2) were OK.  In the case of 
>> > the fuel pump, this had to be replaced.
>> > Thinking this may have been a spike from the alternator, I replaced the 
>> > alternator.
>> > 
>> > Last week (3 years later), motoring back in the dark I had a similar 
>> > problem, but this time only my VHF radio 'blew'.  Again the inline fuse 
>> > was good.  The navigation lights have been replaced with LED lights and 
>> > the AM/FM radio was off.
>> > 
>> > I often motor after long races and this has only happened twice!
>> > 
>> > Does anyone have any ideas as to what may have caused this.  I am an 
>> > engineer so can diagnose most things but this has baffled me.
>> > 
>> > I am about to upgrade my VHF radio for one with DSC and internal GPS and 
>> > to add some wind instruments.  (I have a Raymarine knotmeter/depth meter 
>> > combined, and a EV-100 autopilot.)  I want to separate my electronics 
>> > electrical input and have considered putting them on an isolated battery, 
>> > but charging is a problem.  Is there some circuit protector I can put in 
>> > place to stop this happening again?
>> > 
>> > All suggestions welcomed.
>> > 
>> > BTW - for those of you with 29 mk 1's - you can race them competitively in 
>> > strong winds (as is usual on San Francisco Bay) - keep the boat flat and 
>> > have a really good crew!
>> > 
>> > 
>> > -- 
>> > Ian Matthew
>> > "Siento el Viento"  C 29-1
>> > San Francisco Bay
>> > ___
>> > 
>> > Thanks everyone for supporting this list with your contributions.  Each 
>> > and every one is greatly appreciated.  If you want to support the list - 
>> > use PayPal to send contribution --   https://www.paypal.me/stumurray
>> > 
>> ___
>> 
>> Thanks everyone for supporting this list with your contributions.  Each and 
>> every one is greatly appreciated.  If you want to support the list - use 
>> PayPal to send contribution --   https://www.paypal.me/stumurray
>> 
> 
> 
> ___
> 
> Thanks everyone for supporting this list with your contributions.  Each and 
> every one is greatly appreciated.  If you want to support the list - use 
> PayPal to send contribution --   https://www.paypal.me/stumurray
> 
___

Thanks everyone for supporting this list with your contributions.  Each and 
every one is greatly appreciated.  If you want to support the list - use PayPal 
to send contribution --   https://www.paypal.me/stumurray

___

Thanks everyone for supporting this list with your contributions.  Each and 
every one is greatly appreciated.  If you want to support the list - use PayPal 
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Re: Stus-List Interesting electrical problem

[Don Kern via CnC-List]

It is a Left coast boat, thus aliens


On 9/26/2019 11:57 PM, Jim Watts via CnC-List wrote:
Sounds very much like a lightning strike. I assume you'd know if you'd 
been hit.

Or aliens.

Jim Watts
Paradigm Shift
C 35 Mk III
Victoria, BC


On Thu, 26 Sep 2019 at 14:16, John Irvin via CnC-List 
mailto:cnc-list@cnc-list.com>> wrote:


Any UFO’s in the area?

Sent from my iPhone

> On Sep 26, 2019, at 3:26 PM, Ian Matthew via CnC-List
mailto:cnc-list@cnc-list.com>> wrote:
>
> I have been following the list for many years and I enjoy
reading the wisdom of this group.  I have an interesting problem
and seek your advice.
>
> I have an very intermittent electrical problem (in fact it has
only happened twice in the last 7 years.  In both cases it has
resulted in electrical / electronic components becoming 'blown
out' with all fuses inline remaining good.
>
> The first time I suddenly lost my AM/FM radio and ALL my
navigation lights. The engine also stopped as I had no power to
drive the electric fuel pump. This happened when motoring back
home at night after a long race.  Fortunately there was wind and a
hand-held VHF and a powerful spotlight on the sails allowed us to
be seen by commercial traffic.  Afterwards, I checked - ALL the
incandescent bulbs that were on had blown, but the fuses were OK. 
The radio had internal circuit board components blown but again
the inline fuses (there are 2) were OK.  In the case of the fuel
pump, this had to be replaced.
> Thinking this may have been a spike from the alternator, I
replaced the alternator.
>
> Last week (3 years later), motoring back in the dark I had a
similar problem, but this time only my VHF radio 'blew'.  Again
the inline fuse was good.  The navigation lights have been
replaced with LED lights and the AM/FM radio was off.
>
> I often motor after long races and this has only happened twice!
>
> Does anyone have any ideas as to what may have caused this.  I
am an engineer so can diagnose most things but this has baffled me.
>
> I am about to upgrade my VHF radio for one with DSC and internal
GPS and to add some wind instruments.  (I have a Raymarine
knotmeter/depth meter combined, and a EV-100 autopilot.)  I want
to separate my electronics electrical input and have considered
putting them on an isolated battery, but charging is a problem. 
Is there some circuit protector I can put in place to stop this
happening again?
>
> All suggestions welcomed.
>
> BTW - for those of you with 29 mk 1's - you can race them
competitively in strong winds (as is usual on San Francisco Bay) -
keep the boat flat and have a really good crew!
>
>
> --
> Ian Matthew
> "Siento el Viento"  C 29-1
> San Francisco Bay
> ___
>
> Thanks everyone for supporting this list with your
contributions.  Each and every one is greatly appreciated.  If you
want to support the list - use PayPal to send contribution --
https://www.paypal.me/stumurray
>
___

Thanks everyone for supporting this list with your contributions. 
Each and every one is greatly appreciated.  If you want to support
the list - use PayPal to send contribution --
https://www.paypal.me/stumurray


___

Thanks everyone for supporting this list with your contributions.  Each and 
every one is greatly appreciated.  If you want to support the list - use PayPal 
to send contribution --   https://www.paypal.me/stumurray

___

Thanks everyone for supporting this list with your contributions.  Each and 
every one is greatly appreciated.  If you want to support the list - use PayPal 
to send contribution --   https://www.paypal.me/stumurray

Re: Stus-List Interesting electrical problem

[Don Kern via CnC-List]

Last year the voltage regulator on the alternator died, apparently  
causing a voltage spike. Fried two new batteries and my instrument 
cluster, radio survived.  My usual practice was to charge both batteries 
at the same time when engine is running. When under sail run the 
electronics off one battery, odd (Batt 1) or even (Batt 2) depending on 
the date. Now charge only one battery at a time, depending on which I 
was using for house/electronics. Still powered by an Atomic 4.


Don Kern
Fireball, C MkII
Bristol, RI



On 9/27/2019 3:08 AM, Matti Airas via CnC-List wrote:

Hi,

I'd check the battery and alternator connections carefully. And the 
main switches, too. If the batteries get disconnected while the motor 
is on, the alternator will create a load dump that can be even over 
100V for a fraction of a second. In principle, automotive and marine 
electronics should be protected from that but you never know. I'm only 
speculating, but if that was the reason, maybe the voltage spike was 
short enough that the fuses didn't have time to heat up?


Google for "load dump" if you want to learn more.

Cheers,

Matti Airas
C 36 "Hurma"
Helsinki, Finland


On Thu, 26 Sep 2019 at 22:26, Ian Matthew via CnC-List 
mailto:cnc-list@cnc-list.com>> wrote:


I have been following the list for many years and I enjoy reading
the wisdom of this group.  I have an interesting problem and seek
your advice.

I have an very intermittent electrical problem (in fact it has
only happened twice in the last 7 years.  In both cases it has
resulted in electrical / electronic components becoming 'blown
out' with all fuses inline remaining good.

The first time I suddenly lost my AM/FM radio and ALL my
navigation lights. The engine also stopped as I had no power to
drive the electric fuel pump. This happened when motoring back
home at night after a long race. Fortunately there was wind and a
hand-held VHF and a powerful spotlight on the sails allowed us to
be seen by commercial traffic.  Afterwards, I checked - ALL the
incandescent bulbs that were on had blown, but the fuses were OK. 
The radio had internal circuit board components blown but again
the inline fuses (there are 2) were OK. In the case of the fuel
pump, this had to be replaced.
Thinking this may have been a spike from the alternator, I
replaced the alternator.

Last week (3 years later), motoring back in the dark I had a
similar problem, but this time only my VHF radio 'blew'.  Again
the inline fuse was good.  The navigation lights have been
replaced with LED lights and the AM/FM radio was off.

I often motor after long races and this has only happened twice!

Does anyone have any ideas as to what may have caused this.  I am
an engineer so can diagnose most things but this has baffled me.

I am about to upgrade my VHF radio for one with DSC and internal
GPS and to add some wind instruments.  (I have a Raymarine
knotmeter/depth meter combined, and a EV-100 autopilot.)  I want
to separate my electronics electrical input and have considered
putting them on an isolated battery, but charging is a problem. 
Is there some circuit protector I can put in place to stop this
happening again?

All suggestions welcomed.

BTW - for those of you with 29 mk 1's - you can race them
competitively in strong winds (as is usual on San Francisco Bay) -
keep the boat flat and have a really good crew!


-- 
Ian Matthew

"Siento el Viento"  C 29-1
San Francisco Bay
___

Thanks everyone for supporting this list with your contributions. 
Each and every one is greatly appreciated.  If you want to support
the list - use PayPal to send contribution --
https://www.paypal.me/stumurray


___

Thanks everyone for supporting this list with your contributions.  Each and 
every one is greatly appreciated.  If you want to support the list - use PayPal 
to send contribution --   https://www.paypal.me/stumurray

___

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every one is greatly appreciated.  If you want to support the list - use PayPal 
to send contribution --   https://www.paypal.me/stumurray

Re: Stus-List Interesting electrical problem

[Dennis C. via CnC-List]

Ian,

I'm perplexed.  Can't offer any solution, just a story.  I was driving my
1993 Nissan Pathfinder on the Interstate when the entire truck shut down
and the cabin filled with smoke.  I mean the entire electrical system
died.  No electrical of any kind.

Managed to get to the side of the road and have it towed to a garage.  Had
to replace a whole bunch of electrical components to the tune of $6000.

The garage said the alternator caused a voltage spike.  I filed with my
insurance company and they paid all but deductible and the cost of the new
alternator.

Dennis C.
Touche' 35-1 #83
Mandeville, LA

On Thu, Sep 26, 2019 at 2:26 PM Ian Matthew via CnC-List <
cnc-list@cnc-list.com> wrote:

> I have been following the list for many years and I enjoy reading the
> wisdom of this group.  I have an interesting problem and seek your advice.
>
> I have an very intermittent electrical problem (in fact it has only
> happened twice in the last 7 years.  In both cases it has resulted in
> electrical / electronic components becoming 'blown out' with all fuses
> inline remaining good.
>
> The first time I suddenly lost my AM/FM radio and ALL my navigation
> lights. The engine also stopped as I had no power to drive the electric
> fuel pump. This happened when motoring back home at night after a long
> race.  Fortunately there was wind and a hand-held VHF and a powerful
> spotlight on the sails allowed us to be seen by commercial traffic.
> Afterwards, I checked - ALL the incandescent bulbs that were on had blown,
> but the fuses were OK.  The radio had internal circuit board components
> blown but again the inline fuses (there are 2) were OK.  In the case of the
> fuel pump, this had to be replaced.
> Thinking this may have been a spike from the alternator, I replaced the
> alternator.
>
> Last week (3 years later), motoring back in the dark I had a similar
> problem, but this time only my VHF radio 'blew'.  Again the inline fuse was
> good.  The navigation lights have been replaced with LED lights and the
> AM/FM radio was off.
>
> I often motor after long races and this has only happened twice!
>
> Does anyone have any ideas as to what may have caused this.  I am an
> engineer so can diagnose most things but this has baffled me.
>
> I am about to upgrade my VHF radio for one with DSC and internal GPS and
> to add some wind instruments.  (I have a Raymarine knotmeter/depth meter
> combined, and a EV-100 autopilot.)  I want to separate my electronics
> electrical input and have considered putting them on an isolated battery,
> but charging is a problem.  Is there some circuit protector I can put in
> place to stop this happening again?
>
> All suggestions welcomed.
>
> BTW - for those of you with 29 mk 1's - you can race them competitively in
> strong winds (as is usual on San Francisco Bay) - keep the boat flat and
> have a really good crew!
>
>
> --
> Ian Matthew
> "Siento el Viento"  C 29-1
> San Francisco Bay
> ___
>
> Thanks everyone for supporting this list with your contributions.  Each
> and every one is greatly appreciated.  If you want to support the list -
> use PayPal to send contribution --   https://www.paypal.me/stumurray
>
>
___

Thanks everyone for supporting this list with your contributions.  Each and 
every one is greatly appreciated.  If you want to support the list - use PayPal 
to send contribution --   https://www.paypal.me/stumurray

Re: Stus-List Interesting electrical problem

[dwight veinot via CnC-List]

I lost chart plotter, knot meter, vhf radio and music radio a few years
back due to lightning strike. Boat was on the mooring with no switches on.
I opened the vhf days later and could smell burnt plastic. Also my masthead
vhf antenna got cooked.

On Thu, Sep 26, 2019 at 4:26 PM Ian Matthew via CnC-List <
cnc-list@cnc-list.com> wrote:

> I have been following the list for many years and I enjoy reading the
> wisdom of this group.  I have an interesting problem and seek your advice.
>
> I have an very intermittent electrical problem (in fact it has only
> happened twice in the last 7 years.  In both cases it has resulted in
> electrical / electronic components becoming 'blown out' with all fuses
> inline remaining good.
>
> The first time I suddenly lost my AM/FM radio and ALL my navigation
> lights. The engine also stopped as I had no power to drive the electric
> fuel pump. This happened when motoring back home at night after a long
> race.  Fortunately there was wind and a hand-held VHF and a powerful
> spotlight on the sails allowed us to be seen by commercial traffic.
> Afterwards, I checked - ALL the incandescent bulbs that were on had blown,
> but the fuses were OK.  The radio had internal circuit board components
> blown but again the inline fuses (there are 2) were OK.  In the case of the
> fuel pump, this had to be replaced.
> Thinking this may have been a spike from the alternator, I replaced the
> alternator.
>
> Last week (3 years later), motoring back in the dark I had a similar
> problem, but this time only my VHF radio 'blew'.  Again the inline fuse was
> good.  The navigation lights have been replaced with LED lights and the
> AM/FM radio was off.
>
> I often motor after long races and this has only happened twice!
>
> Does anyone have any ideas as to what may have caused this.  I am an
> engineer so can diagnose most things but this has baffled me.
>
> I am about to upgrade my VHF radio for one with DSC and internal GPS and
> to add some wind instruments.  (I have a Raymarine knotmeter/depth meter
> combined, and a EV-100 autopilot.)  I want to separate my electronics
> electrical input and have considered putting them on an isolated battery,
> but charging is a problem.  Is there some circuit protector I can put in
> place to stop this happening again?
>
> All suggestions welcomed.
>
> BTW - for those of you with 29 mk 1's - you can race them competitively in
> strong winds (as is usual on San Francisco Bay) - keep the boat flat and
> have a really good crew!
>
>
> --
> Ian Matthew
> "Siento el Viento"  C 29-1
> San Francisco Bay
> ___
>
> Thanks everyone for supporting this list with your contributions.  Each
> and every one is greatly appreciated.  If you want to support the list -
> use PayPal to send contribution --   https://www.paypal.me/stumurray
>
> --
Sent from Gmail Mobile
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Re: Stus-List Interesting electrical problem

[Matti Airas via CnC-List]

Hi,

I'd check the battery and alternator connections carefully. And the main
switches, too. If the batteries get disconnected while the motor is on, the
alternator will create a load dump that can be even over 100V for a
fraction of a second. In principle, automotive and marine electronics
should be protected from that but you never know. I'm only speculating, but
if that was the reason, maybe the voltage spike was short enough that the
fuses didn't have time to heat up?

Google for "load dump" if you want to learn more.

Cheers,

Matti Airas
C 36 "Hurma"
Helsinki, Finland


On Thu, 26 Sep 2019 at 22:26, Ian Matthew via CnC-List <
cnc-list@cnc-list.com> wrote:

> I have been following the list for many years and I enjoy reading the
> wisdom of this group.  I have an interesting problem and seek your advice.
>
> I have an very intermittent electrical problem (in fact it has only
> happened twice in the last 7 years.  In both cases it has resulted in
> electrical / electronic components becoming 'blown out' with all fuses
> inline remaining good.
>
> The first time I suddenly lost my AM/FM radio and ALL my navigation
> lights. The engine also stopped as I had no power to drive the electric
> fuel pump. This happened when motoring back home at night after a long
> race.  Fortunately there was wind and a hand-held VHF and a powerful
> spotlight on the sails allowed us to be seen by commercial traffic.
> Afterwards, I checked - ALL the incandescent bulbs that were on had blown,
> but the fuses were OK.  The radio had internal circuit board components
> blown but again the inline fuses (there are 2) were OK.  In the case of the
> fuel pump, this had to be replaced.
> Thinking this may have been a spike from the alternator, I replaced the
> alternator.
>
> Last week (3 years later), motoring back in the dark I had a similar
> problem, but this time only my VHF radio 'blew'.  Again the inline fuse was
> good.  The navigation lights have been replaced with LED lights and the
> AM/FM radio was off.
>
> I often motor after long races and this has only happened twice!
>
> Does anyone have any ideas as to what may have caused this.  I am an
> engineer so can diagnose most things but this has baffled me.
>
> I am about to upgrade my VHF radio for one with DSC and internal GPS and
> to add some wind instruments.  (I have a Raymarine knotmeter/depth meter
> combined, and a EV-100 autopilot.)  I want to separate my electronics
> electrical input and have considered putting them on an isolated battery,
> but charging is a problem.  Is there some circuit protector I can put in
> place to stop this happening again?
>
> All suggestions welcomed.
>
> BTW - for those of you with 29 mk 1's - you can race them competitively in
> strong winds (as is usual on San Francisco Bay) - keep the boat flat and
> have a really good crew!
>
>
> --
> Ian Matthew
> "Siento el Viento"  C 29-1
> San Francisco Bay
> ___
>
> Thanks everyone for supporting this list with your contributions.  Each
> and every one is greatly appreciated.  If you want to support the list -
> use PayPal to send contribution --   https://www.paypal.me/stumurray
>
>
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Re: Stus-List Interesting electrical problem

[Ian Matthew via CnC-List]

You guys are funny.  Yes I live on the left coast, but aliens?

Ian Matthew
SF.

On Thu, Sep 26, 2019 at 10:31 PM sv Rebecca Leah via CnC-List <
cnc-list@cnc-list.com> wrote:

> My vote is aliens. Or the Russian navy.
>
>
>
> Doug Mountjoy
> Sv Rebecca Leah
> C LF39
> 253-208-1412
> Port Orchard YC wa.
>
>  Original message 
> From: Jim Watts via CnC-List 
> Date: 9/26/19 20:57 (GMT-08:00)
> To: 1 CnC List 
> Cc: Jim Watts 
> Subject: Re: Stus-List Interesting electrical problem
>
> Sounds very much like a lightning strike. I assume you'd know if you'd
> been hit.
> Or aliens.
>
> Jim Watts
> Paradigm Shift
> C 35 Mk III
> Victoria, BC
>
>
> On Thu, 26 Sep 2019 at 14:16, John Irvin via CnC-List <
> cnc-list@cnc-list.com> wrote:
>
>> Any UFO’s in the area?
>>
>
>> --
Ian Matthew
"Siento el Viento" C 29-1
San Francisco Bay

Sent from my iPad using Gmail Mobile
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Re: Stus-List Interesting electrical problem

[sv Rebecca Leah via CnC-List]

My vote is aliens. Or the Russian navy. Doug Mountjoy Sv Rebecca Leah C 
LF39253-208-1412Port Orchard YC wa.
 Original message From: Jim Watts via CnC-List 
 Date: 9/26/19  20:57  (GMT-08:00) To: 1 CnC List 
 Cc: Jim Watts  Subject: Re: 
Stus-List Interesting electrical problem Sounds very much like a lightning 
strike. I assume you'd know if you'd been hit.Or aliens. Jim WattsParadigm 
ShiftC 35 Mk IIIVictoria, BCOn Thu, 26 Sep 2019 at 14:16, John Irvin via 
CnC-List  wrote:Any UFO’s in the area?

Sent from my iPhone

> On Sep 26, 2019, at 3:26 PM, Ian Matthew via CnC-List  
> wrote:
> 
> I have been following the list for many years and I enjoy reading the wisdom 
> of this group.  I have an interesting problem and seek your advice.
> 
> I have an very intermittent electrical problem (in fact it has only happened 
> twice in the last 7 years.  In both cases it has resulted in electrical / 
> electronic components becoming 'blown out' with all fuses inline remaining 
> good.
> 
> The first time I suddenly lost my AM/FM radio and ALL my navigation lights. 
> The engine also stopped as I had no power to drive the electric fuel pump. 
> This happened when motoring back home at night after a long race.  
> Fortunately there was wind and a hand-held VHF and a powerful spotlight on 
> the sails allowed us to be seen by commercial traffic.  Afterwards, I checked 
> - ALL the incandescent bulbs that were on had blown, but the fuses were OK.  
> The radio had internal circuit board components blown but again the inline 
> fuses (there are 2) were OK.  In the case of the fuel pump, this had to be 
> replaced.
> Thinking this may have been a spike from the alternator, I replaced the 
> alternator.
> 
> Last week (3 years later), motoring back in the dark I had a similar problem, 
> but this time only my VHF radio 'blew'.  Again the inline fuse was good.  The 
> navigation lights have been replaced with LED lights and the AM/FM radio was 
> off.
> 
> I often motor after long races and this has only happened twice!
> 
> Does anyone have any ideas as to what may have caused this.  I am an engineer 
> so can diagnose most things but this has baffled me.
> 
> I am about to upgrade my VHF radio for one with DSC and internal GPS and to 
> add some wind instruments.  (I have a Raymarine knotmeter/depth meter 
> combined, and a EV-100 autopilot.)  I want to separate my electronics 
> electrical input and have considered putting them on an isolated battery, but 
> charging is a problem.  Is there some circuit protector I can put in place to 
> stop this happening again?
> 
> All suggestions welcomed.
> 
> BTW - for those of you with 29 mk 1's - you can race them competitively in 
> strong winds (as is usual on San Francisco Bay) - keep the boat flat and have 
> a really good crew!
> 
> 
> -- 
> Ian Matthew
> "Siento el Viento"  C 29-1
> San Francisco Bay
> ___
> 
> Thanks everyone for supporting this list with your contributions.  Each and 
> every one is greatly appreciated.  If you want to support the list - use 
> PayPal to send contribution --   https://www.paypal.me/stumurray
> 
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every one is greatly appreciated.  If you want to support the list - use PayPal 
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___

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Re: Stus-List Interesting electrical problem

[Jim Watts via CnC-List]

Sounds very much like a lightning strike. I assume you'd know if you'd been
hit.
Or aliens.

Jim Watts
Paradigm Shift
C 35 Mk III
Victoria, BC


On Thu, 26 Sep 2019 at 14:16, John Irvin via CnC-List 
wrote:

> Any UFO’s in the area?
>
> Sent from my iPhone
>
> > On Sep 26, 2019, at 3:26 PM, Ian Matthew via CnC-List <
> cnc-list@cnc-list.com> wrote:
> >
> > I have been following the list for many years and I enjoy reading the
> wisdom of this group.  I have an interesting problem and seek your advice.
> >
> > I have an very intermittent electrical problem (in fact it has only
> happened twice in the last 7 years.  In both cases it has resulted in
> electrical / electronic components becoming 'blown out' with all fuses
> inline remaining good.
> >
> > The first time I suddenly lost my AM/FM radio and ALL my navigation
> lights. The engine also stopped as I had no power to drive the electric
> fuel pump. This happened when motoring back home at night after a long
> race.  Fortunately there was wind and a hand-held VHF and a powerful
> spotlight on the sails allowed us to be seen by commercial traffic.
> Afterwards, I checked - ALL the incandescent bulbs that were on had blown,
> but the fuses were OK.  The radio had internal circuit board components
> blown but again the inline fuses (there are 2) were OK.  In the case of the
> fuel pump, this had to be replaced.
> > Thinking this may have been a spike from the alternator, I replaced the
> alternator.
> >
> > Last week (3 years later), motoring back in the dark I had a similar
> problem, but this time only my VHF radio 'blew'.  Again the inline fuse was
> good.  The navigation lights have been replaced with LED lights and the
> AM/FM radio was off.
> >
> > I often motor after long races and this has only happened twice!
> >
> > Does anyone have any ideas as to what may have caused this.  I am an
> engineer so can diagnose most things but this has baffled me.
> >
> > I am about to upgrade my VHF radio for one with DSC and internal GPS and
> to add some wind instruments.  (I have a Raymarine knotmeter/depth meter
> combined, and a EV-100 autopilot.)  I want to separate my electronics
> electrical input and have considered putting them on an isolated battery,
> but charging is a problem.  Is there some circuit protector I can put in
> place to stop this happening again?
> >
> > All suggestions welcomed.
> >
> > BTW - for those of you with 29 mk 1's - you can race them competitively
> in strong winds (as is usual on San Francisco Bay) - keep the boat flat and
> have a really good crew!
> >
> >
> > --
> > Ian Matthew
> > "Siento el Viento"  C 29-1
> > San Francisco Bay
> > ___
> >
> > Thanks everyone for supporting this list with your contributions.  Each
> and every one is greatly appreciated.  If you want to support the list -
> use PayPal to send contribution --   https://www.paypal.me/stumurray
> >
> ___
>
> Thanks everyone for supporting this list with your contributions.  Each
> and every one is greatly appreciated.  If you want to support the list -
> use PayPal to send contribution --   https://www.paypal.me/stumurray
>
>
___

Thanks everyone for supporting this list with your contributions.  Each and 
every one is greatly appreciated.  If you want to support the list - use PayPal 
to send contribution --   https://www.paypal.me/stumurray

Re: Stus-List Interesting electrical problem

[John Irvin via CnC-List]

Any UFO’s in the area?

Sent from my iPhone

> On Sep 26, 2019, at 3:26 PM, Ian Matthew via CnC-List  
> wrote:
> 
> I have been following the list for many years and I enjoy reading the wisdom 
> of this group.  I have an interesting problem and seek your advice.
> 
> I have an very intermittent electrical problem (in fact it has only happened 
> twice in the last 7 years.  In both cases it has resulted in electrical / 
> electronic components becoming 'blown out' with all fuses inline remaining 
> good.
> 
> The first time I suddenly lost my AM/FM radio and ALL my navigation lights. 
> The engine also stopped as I had no power to drive the electric fuel pump. 
> This happened when motoring back home at night after a long race.  
> Fortunately there was wind and a hand-held VHF and a powerful spotlight on 
> the sails allowed us to be seen by commercial traffic.  Afterwards, I checked 
> - ALL the incandescent bulbs that were on had blown, but the fuses were OK.  
> The radio had internal circuit board components blown but again the inline 
> fuses (there are 2) were OK.  In the case of the fuel pump, this had to be 
> replaced.
> Thinking this may have been a spike from the alternator, I replaced the 
> alternator.
> 
> Last week (3 years later), motoring back in the dark I had a similar problem, 
> but this time only my VHF radio 'blew'.  Again the inline fuse was good.  The 
> navigation lights have been replaced with LED lights and the AM/FM radio was 
> off.
> 
> I often motor after long races and this has only happened twice!
> 
> Does anyone have any ideas as to what may have caused this.  I am an engineer 
> so can diagnose most things but this has baffled me.
> 
> I am about to upgrade my VHF radio for one with DSC and internal GPS and to 
> add some wind instruments.  (I have a Raymarine knotmeter/depth meter 
> combined, and a EV-100 autopilot.)  I want to separate my electronics 
> electrical input and have considered putting them on an isolated battery, but 
> charging is a problem.  Is there some circuit protector I can put in place to 
> stop this happening again?
> 
> All suggestions welcomed.
> 
> BTW - for those of you with 29 mk 1's - you can race them competitively in 
> strong winds (as is usual on San Francisco Bay) - keep the boat flat and have 
> a really good crew!
> 
> 
> -- 
> Ian Matthew
> "Siento el Viento"  C 29-1
> San Francisco Bay
> ___
> 
> Thanks everyone for supporting this list with your contributions.  Each and 
> every one is greatly appreciated.  If you want to support the list - use 
> PayPal to send contribution --   https://www.paypal.me/stumurray
> 
___

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every one is greatly appreciated.  If you want to support the list - use PayPal 
to send contribution --   https://www.paypal.me/stumurray

Re: Stus-List Interesting electrical problem

[Jeff Helsdingen via CnC-List]

Personally I usually find that strange electrical problems especially on
boats are grounding problems. Yours sounds very peculiar though. From an
isolating batteries point of view i would consider adding a Victron battery
isolator. That would get your house and start batteries apart if the
problem was coming from the alternator. I think I would also consider
adding fusing on the ground side of the vhf etc. Not sure.

Jeff

On Thu., Sep. 26, 2019, 3:26 p.m. Ian Matthew via CnC-List, <
cnc-list@cnc-list.com> wrote:

> I have been following the list for many years and I enjoy reading the
> wisdom of this group.  I have an interesting problem and seek your advice.
>
> I have an very intermittent electrical problem (in fact it has only
> happened twice in the last 7 years.  In both cases it has resulted in
> electrical / electronic components becoming 'blown out' with all fuses
> inline remaining good.
>
> The first time I suddenly lost my AM/FM radio and ALL my navigation
> lights. The engine also stopped as I had no power to drive the electric
> fuel pump. This happened when motoring back home at night after a long
> race.  Fortunately there was wind and a hand-held VHF and a powerful
> spotlight on the sails allowed us to be seen by commercial traffic.
> Afterwards, I checked - ALL the incandescent bulbs that were on had blown,
> but the fuses were OK.  The radio had internal circuit board components
> blown but again the inline fuses (there are 2) were OK.  In the case of the
> fuel pump, this had to be replaced.
> Thinking this may have been a spike from the alternator, I replaced the
> alternator.
>
> Last week (3 years later), motoring back in the dark I had a similar
> problem, but this time only my VHF radio 'blew'.  Again the inline fuse was
> good.  The navigation lights have been replaced with LED lights and the
> AM/FM radio was off.
>
> I often motor after long races and this has only happened twice!
>
> Does anyone have any ideas as to what may have caused this.  I am an
> engineer so can diagnose most things but this has baffled me.
>
> I am about to upgrade my VHF radio for one with DSC and internal GPS and
> to add some wind instruments.  (I have a Raymarine knotmeter/depth meter
> combined, and a EV-100 autopilot.)  I want to separate my electronics
> electrical input and have considered putting them on an isolated battery,
> but charging is a problem.  Is there some circuit protector I can put in
> place to stop this happening again?
>
> All suggestions welcomed.
>
> BTW - for those of you with 29 mk 1's - you can race them competitively in
> strong winds (as is usual on San Francisco Bay) - keep the boat flat and
> have a really good crew!
>
>
> --
> Ian Matthew
> "Siento el Viento"  C 29-1
> San Francisco Bay
> ___
>
> Thanks everyone for supporting this list with your contributions.  Each
> and every one is greatly appreciated.  If you want to support the list -
> use PayPal to send contribution --   https://www.paypal.me/stumurray
>
>
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Thanks everyone for supporting this list with your contributions.  Each and 
every one is greatly appreciated.  If you want to support the list - use PayPal 
to send contribution --   https://www.paypal.me/stumurray

Stus-List Interesting electrical problem

[Ian Matthew via CnC-List]

I have been following the list for many years and I enjoy reading the
wisdom of this group.  I have an interesting problem and seek your advice.

I have an very intermittent electrical problem (in fact it has only
happened twice in the last 7 years.  In both cases it has resulted in
electrical / electronic components becoming 'blown out' with all fuses
inline remaining good.

The first time I suddenly lost my AM/FM radio and ALL my navigation lights.
The engine also stopped as I had no power to drive the electric fuel pump.
This happened when motoring back home at night after a long race.
Fortunately there was wind and a hand-held VHF and a powerful spotlight on
the sails allowed us to be seen by commercial traffic.  Afterwards, I
checked - ALL the incandescent bulbs that were on had blown, but the fuses
were OK.  The radio had internal circuit board components blown but again
the inline fuses (there are 2) were OK.  In the case of the fuel pump, this
had to be replaced.
Thinking this may have been a spike from the alternator, I replaced the
alternator.

Last week (3 years later), motoring back in the dark I had a similar
problem, but this time only my VHF radio 'blew'.  Again the inline fuse was
good.  The navigation lights have been replaced with LED lights and the
AM/FM radio was off.

I often motor after long races and this has only happened twice!

Does anyone have any ideas as to what may have caused this.  I am an
engineer so can diagnose most things but this has baffled me.

I am about to upgrade my VHF radio for one with DSC and internal GPS and to
add some wind instruments.  (I have a Raymarine knotmeter/depth meter
combined, and a EV-100 autopilot.)  I want to separate my electronics
electrical input and have considered putting them on an isolated battery,
but charging is a problem.  Is there some circuit protector I can put in
place to stop this happening again?

All suggestions welcomed.

BTW - for those of you with 29 mk 1's - you can race them competitively in
strong winds (as is usual on San Francisco Bay) - keep the boat flat and
have a really good crew!


-- 
Ian Matthew
"Siento el Viento"  C 29-1
San Francisco Bay
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every one is greatly appreciated.  If you want to support the list - use PayPal 
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Re: Stus-List Interesting Electrical Problem

[Gary Russell via CnC-List]

I can imagine a loose connection on the battery terminal while charging
could cause a large voltage spike from the alternator.
Gary
S/V Kaylarah
'90 C 37+
East Greenwich, RI, USA

~~~_/)~~


On Tue, Jul 26, 2016 at 3:04 PM, Ian Matthew via CnC-List <
cnc-list@cnc-list.com> wrote:

> Almost never get lightning here. And I was on the boat simply motoring
> away from the dock when it happened.
>
>
> On Tuesday, July 26, 2016, Gary Russell via CnC-List <
> cnc-list@cnc-list.com> wrote:
>
>> Are you sure it wasn't a lightning strike?
>> Gary
>> S/V Kaylarah
>> '90 C 37+
>> East Greenwich, RI, USA
>>
>> ~~~_/)~
>>
>
>
> --
> Ian Matthew
> "Siento el Viento" C 29 mk 1
> San Francisco Bay
>
> Sent from my iPad using Gmail Mobile
>
> ___
>
> This list is supported by the generous donations of our members. If you
> like what we do, please help us pay for our costs by donating. All
> Contributions are greatly appreciated!
>
>
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what we do, please help us pay for our costs by donating. All Contributions are 
greatly appreciated!

Re: Stus-List Interesting Electrical Problem

[Ian Matthew via CnC-List]

Almost never get lightning here. And I was on the boat simply motoring away
from the dock when it happened.

On Tuesday, July 26, 2016, Gary Russell via CnC-List 
wrote:

> Are you sure it wasn't a lightning strike?
> Gary
> S/V Kaylarah
> '90 C 37+
> East Greenwich, RI, USA
>
> ~~~_/)~
>


-- 
Ian Matthew
"Siento el Viento" C 29 mk 1
San Francisco Bay

Sent from my iPad using Gmail Mobile
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Re: Stus-List Interesting Electrical Problem

[Gary Russell via CnC-List]

Are you sure it wasn't a lightning strike?
Gary
S/V Kaylarah
'90 C 37+
East Greenwich, RI, USA

~~~_/)~~


On Tue, Jul 26, 2016 at 2:37 PM, Ian Matthew via CnC-List <
cnc-list@cnc-list.com> wrote:

> Hi,
>
> I am soliciting help from this incredibly wise forum.  I thought at first
> this was a random problem, but now it has happened twice, I am not sure.
>
> I have had a 'surge' blow my electronics, AM/FM radio and my navigation
> lights twice in 2 years.  I can't afford to replace my electronics again
> after I've installed this 3rd replacement.  In both cases, my knotmeter /
> depth gauge blew, my AM/FM radio fried and the incandescent light bulbs in
> my running lights blew.  In all cases, not a single fuse blew.
> Interestingly, my mast lights were OK, my VHF radio was OK and my cabin
> lights were OK.  The first time all were on, this time the AM/FM radio and
> instruments were on, but the running lights were off.
>
> I am thinking it may be a voltage regulator problem on my alternator, I
> have an A-4, but can't be sure.  Maybe the safest thing is to replace it
> anyway.  (Last time this happened, I had my mechanic check the alternator
> and he couldn't find anything wrong.)
>
> One other solution could be to run my electronics and AM/FM radio (when I
> replace it) off a separate circuit which is not charged by the engine.
> That would keep the circuit isolated perhaps.
>
> Anyone had this happen to them or have any ideas?
>
> BTW - I don't cruise in my boat, just race socharging the battery through
> shore power is not going to be a problem.
>
> --
> Ian Matthew
> "Siento el Viento"  C 29-1
> San Francisco Bay
>
> ___
>
> This list is supported by the generous donations of our members. If you
> like what we do, please help us pay for our costs by donating. All
> Contributions are greatly appreciated!
>
>
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what we do, please help us pay for our costs by donating. All Contributions are 
greatly appreciated!

Stus-List Interesting Electrical Problem

[Ian Matthew via CnC-List]

Hi,

I am soliciting help from this incredibly wise forum.  I thought at first
this was a random problem, but now it has happened twice, I am not sure.

I have had a 'surge' blow my electronics, AM/FM radio and my navigation
lights twice in 2 years.  I can't afford to replace my electronics again
after I've installed this 3rd replacement.  In both cases, my knotmeter /
depth gauge blew, my AM/FM radio fried and the incandescent light bulbs in
my running lights blew.  In all cases, not a single fuse blew.
Interestingly, my mast lights were OK, my VHF radio was OK and my cabin
lights were OK.  The first time all were on, this time the AM/FM radio and
instruments were on, but the running lights were off.

I am thinking it may be a voltage regulator problem on my alternator, I
have an A-4, but can't be sure.  Maybe the safest thing is to replace it
anyway.  (Last time this happened, I had my mechanic check the alternator
and he couldn't find anything wrong.)

One other solution could be to run my electronics and AM/FM radio (when I
replace it) off a separate circuit which is not charged by the engine.
That would keep the circuit isolated perhaps.

Anyone had this happen to them or have any ideas?

BTW - I don't cruise in my boat, just race socharging the battery through
shore power is not going to be a problem.

-- 
Ian Matthew
"Siento el Viento"  C 29-1
San Francisco Bay
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