We recently updated the 12V system on our 33-2 this year. We reached out
to an ABYC marine electrician for advice about our plan.
I won't re-hash other thoughts in the previous emails, but my two cents:
- Connections are often an issue and the first place to look. Connections
may visually appear in good condition, but a loose connection can be an
issue.
- House and starter battery should never be able to see each other. A large
house bank at 60% charge connected to a fully charged starting battery can
draw a lot of current over the circuit from of the starting battery to the
house and make it difficult to start... Our electrician recommended we put
a battery management panel in place with two battery switches so the two
batteries remain independent and if the starter battery dies, we could
adjust the switch to start using the house isolating the starting battery
from the circuit completely.
- Our starting battery gets charge via a Xantrex Echo Charge and all of our
charging inputs go directly to the house (solar, battery charger,
alternator, etc). This again is to make sure the house and starting
batteries are isolated and the most amount of energy can be put into the
largest battery bank.
One thing I would like to know is how you got the 4-Trojan's in place... We
looked at changing our battery arrangement and decided it was too hard so
our house is 2-G31 batteries with an isolated G24 starting battery. One
big plus of this change is that the engine fires up on the first go where
it used to take 2-3 tries to get her going when cold.
Cheers,
Michael Egberts
theegbertsfam...@gmail.com
Big Lou - C 33-2
On Wed, Aug 14, 2019 at 9:33 AM Dave S via CnC-List
wrote:
> Good luck with the troubleshooting.
> Can’t recall if I responded with this but some 33-2 electrical info and
> photos here
>
> http://cncwindstar.blogspot.com/p/blog-page.html?m=1
>
> Dave
>
> Sent from my iPhone
>
> On Aug 14, 2019, at 8:46 AM, Wade Glew wrote:
>
> thank you to all who responded to my email. I wont be back to the boat
> for a couple of weeks but you've all given me lots of information and
> suggestions of a plan to go forwards. Thanks again, will let you know how
> it goes
> Wade
> Oh Boy C 33 MK II
>
> On Tue, Aug 13, 2019 at 9:31 PM Garry Cross via CnC-List <
> cnc-list@cnc-list.com> wrote:
>
>> My 2 cents.
>> Sounds to me like two different bad connections. There is a bad
>> connection, likely ground path on Batt 2, just the load of the normal house
>> circuits cannot flow through it. For Batt 1 it sounds like another bad
>> connection but the house circuit does not draw enough current to drop the
>> voltage enough that things stop working but the start current drops the
>> voltage to much. It's all about ohm's law. I = V/R or V = I*R. So with low
>> amps there is less voltage drop over a bad connection. Raise the current
>> and you produce more voltage drop. Push 1 amp through a 6 ohm resistance
>> and your gonna drop 6V. Put a voltmeter there with no load it will read
>> 12V.
>> Another way, put a voltmeter between the battery - terminal and the + at
>> the starter. It likely will read 12v. If you hit the start button and the
>> voltage stays at 12v then the issue is in the ground path. If it drops the
>> issue is in the hot path.
>>
>>
>>
>> -- Forwarded message --
>>> From: Jeff Helsdingen
>>> To: cnc-list@cnc-list.com
>>> Cc:
>>> Bcc:
>>> Date: Tue, 13 Aug 2019 18:47:46 -0400
>>> Subject: Re: Stus-List Electrical Advice
>>> I would imagine it would also be prudent to check the connection of all
>>> the ring terminals on both the power and ground circuits from the battery
>>> through the battery switch and to the starter. Since it's a "new" problem
>>> I wouldn't immediately think that wire sizing might be a problem as well
>>> but "original" cabling that has had lots of extra things added can suddenly
>>> become undersized quickly too.
>>>
>>> Jeff Helsdingen
>>> Caposhi
>>> C 35 mk 1 #54
>>> Port Stanley On.
>>>
>>> On Tue, Aug 13, 2019 at 2:14 PM Frederick G Street via CnC-List <
>>> cnc-list@cnc-list.com> wrote:
>>>
Agreed, sounds like a bad ground. Voltage is one thing; but enough
current to crank is another, and definitely something that will be
adversely affected by bad ground continuity.
— Fred
Fred Street -- Minneapolis
S/V Oceanis (1979 C Landfall 38) -- Bayfield, WI
On Aug 13, 2019, at 12:39 PM, Dennis C. via CnC-List <
cnc-list@cnc-list.com> wrote:
Clean all the ground connections.
Dennis C.
On Tue, Aug 13, 2019 at 12:26 PM Wade Glew via CnC-List <
cnc-list@cnc-list.com> wrote:
> Hello listers, I would appreciate any advice you might have on my
> electrical issue du jour.
>
> Mine is a C 33 MK II and I have a Link 20 battery monitoring
> system. Bank 1 (house) is 4 Trojan T-105 (225 AH) 6V deep cycles about 5
> years old. Bank 2 is a 12V starter battery
