Stus-List blown alternator diode
When I blew my diodes, the engine controls charging light came on... The guy I bought my alternator from is still on Ebay Just search for Yanmar 3GM30 Alternator on eBay. He's selling them for $120.00 free shipping for a 55 or 60 amp brand new fully insulated Hitachi. I think Hitachi is the OEM for Yanmar as it looked perfectly identical to the $700.00 Yanmar piece except for the fan behind the pulley. The Yanmar is solid, the Hitachi has the traditional fan blades. All the connections and mounting are identical, it's a 30 minutes plug and play affair to install. -Francois 1990 34+ "Take Five" Lake Lanier, Georgia ___ This List is provided by the C&C Photo Album Email address: CnC-List@cnc-list.com To change your list preferences, including unsubscribing -- go bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com
Re: Stus-List blown alternator diode
I read that here on an earlier C&C thread - but I thought that
you could switch between 1 - both - 2 without a problem - just
don't flip through the "off" position.
I did find a MaineSail article on SailBoat Owners where he
describes re-wiring the switch so that the alternator charge is
going directly back to the battery and avoids the risk of the
switch rotating through the off position.
Mark
There is no cure for birth and death save to enjoy the interval.
- George Santayana
On 15/08/2014 10:34 AM, Jerome Tauber via CnC-List wrote:
The most common cause of diode failure on older boats
is turning the battery 1-2-all switch while the engine is
running. This causes a brief period of no load on the
alternator and blows the diodes. Jerry C&C 27 V
-Original
Message-
From: Jack Fitzgerald via CnC-List
To: Burt Stratton ;
C&CList
Sent: Fri, Aug 15, 2014 8:45 am
Subject: Re: Stus-List blown alternator diode
Also, you will notice that your batteries
will discharge much faster than normal when used sail if
it is the blocking diodes that have failed as the
alternator will become a very large drain.
Jack Fitzgerald
C&C 39 TM
Savannah, GA
On Fri, Aug 15, 2014 at 8:36
AM, Burt Stratton via CnC-List <cnc-list@cnc-list.com>
wrote:
Simple
answer:
Most
do have internal diodes. To be sure you can
google the part number of the alternator or
look it up on the manufacturers web site.
You
should see around 13.5 to 14 ish volts
across your starting battery terminals when
running. It will vary a little depending on
the condition of the battery. If you have an
ammeter you should see it move to the plus
side of zero after starting. If you see 12
or less volts across your starting battery
terminals when running or negative amps when
running you have a problem with the
alternator which could be the voltage
regulator or diodes (assuming the belt is
not slipping).
Skip
From:
CnC-List [mailto:cnc-list-boun...@cnc-list.com]
On Behalf Of wwadjo...@aol.com
via CnC-List
Sent: Friday, August 15, 2014
8:21 AM
To: Brad Crawford via CnC-List
Subject: Re: Stus-List blown
alternator diode
The thread on
alternators got me to ask myself, "how
do you known if you have an internal
diode on alternator, and how do you know
if "blown?"
I am, electrically
challenged, admittedly.
Bill Walker
CnC 36
Sent from my HTC
___
Re: Stus-List blown alternator diode
Thought most were make before break switches Dwight Veinot C&C 35MKII, Alianna Head of St. Margaret's Bay, NS _ From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Jerome Tauber via CnC-List Sent: August 15, 2014 10:34 AM To: j...@fitzgeraldforwarding.com; cnc-list@cnc-list.com; bstrat...@falconnect.com Subject: Re: Stus-List blown alternator diode The most common cause of diode failure on older boats is turning the battery 1-2-all switch while the engine is running. This causes a brief period of no load on the alternator and blows the diodes. Jerry C&C 27 V -Original Message- From: Jack Fitzgerald via CnC-List To: Burt Stratton ; C&CList Sent: Fri, Aug 15, 2014 8:45 am Subject: Re: Stus-List blown alternator diode Also, you will notice that your batteries will discharge much faster than normal when used sail if it is the blocking diodes that have failed as the alternator will become a very large drain. Jack Fitzgerald C&C 39 TM Savannah, GA On Fri, Aug 15, 2014 at 8:36 AM, Burt Stratton via CnC-List wrote: Simple answer: Most do have internal diodes. To be sure you can google the part number of the alternator or look it up on the manufacturers web site. You should see around 13.5 to 14 ish volts across your starting battery terminals when running. It will vary a little depending on the condition of the battery. If you have an ammeter you should see it move to the plus side of zero after starting. If you see 12 or less volts across your starting battery terminals when running or negative amps when running you have a problem with the alternator which could be the voltage regulator or diodes (assuming the belt is not slipping). Skip From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of wwadjo...@aol.com via CnC-List Sent: Friday, August 15, 2014 8:21 AM To: Brad Crawford via CnC-List Subject: Re: Stus-List blown alternator diode The thread on alternators got me to ask myself, "how do you known if you have an internal diode on alternator, and how do you know if "blown?" I am, electrically challenged, admittedly. Bill Walker CnC 36 Sent from my HTC ___ This List is provided by the C&C Photo Album Email address: CnC-List@cnc-list.com To change your list preferences, including unsubscribing -- go bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com ___ This List is provided by the C&C Photo Album Email address: CnC-List@cnc-list.com To change your list preferences, including unsubscribing -- go bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com _ No virus found in this message. Checked by AVG - www.avg.com Version: 2014.0.4716 / Virus Database: 3986/8000 - Release Date: 08/07/14 Internal Virus Database is out of date. ___ This List is provided by the C&C Photo Album Email address: CnC-List@cnc-list.com To change your list preferences, including unsubscribing -- go bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com
Re: Stus-List blown alternator diode
Too true, and the alternator can seem ok while charging. Happened to us on a friend's boat in Florida this winter. Took the alternator to a Miami alternator shop, they put it on a machine, it produced 14.7 V and they said it was ok. We later discovered that the alternator was getting warm every time the battery switch was on, and not just when it was supposed to be energised. Back to the shop and they replaced a circuit board for $35. End of problem. Alternator was really really difficult to get at, or we might have figured it out sooner. Steve Thomas C&C27 MKIII - Original Message - From: Jack Fitzgerald via CnC-List To: Burt Stratton ; C&CList Sent: Friday, August 15, 2014 8:44 AM Subject: Re: Stus-List blown alternator diode Also, you will notice that your batteries will discharge much faster than normal when used sail if it is the blocking diodes that have failed as the alternator will become a very large drain. Jack Fitzgerald C&C 39 TM Savannah, GA On Fri, Aug 15, 2014 at 8:36 AM, Burt Stratton via CnC-List wrote: Simple answer: Most do have internal diodes. To be sure you can google the part number of the alternator or look it up on the manufacturers web site. You should see around 13.5 to 14 ish volts across your starting battery terminals when running. It will vary a little depending on the condition of the battery. If you have an ammeter you should see it move to the plus side of zero after starting. If you see 12 or less volts across your starting battery terminals when running or negative amps when running you have a problem with the alternator which could be the voltage regulator or diodes (assuming the belt is not slipping). Skip From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of wwadjo...@aol.com via CnC-List Sent: Friday, August 15, 2014 8:21 AM To: Brad Crawford via CnC-List Subject: Re: Stus-List blown alternator diode The thread on alternators got me to ask myself, "how do you known if you have an internal diode on alternator, and how do you know if "blown?" I am, electrically challenged, admittedly. Bill Walker CnC 36 Sent from my HTC ___ This List is provided by the C&C Photo Album Email address: CnC-List@cnc-list.com To change your list preferences, including unsubscribing -- go bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com -- ___ This List is provided by the C&C Photo Album Email address: CnC-List@cnc-list.com To change your list preferences, including unsubscribing -- go bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com ___ This List is provided by the C&C Photo Album Email address: CnC-List@cnc-list.com To change your list preferences, including unsubscribing -- go bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com
Re: Stus-List blown alternator diode
Lower output in measured DC Amps. For the more electrically savvy, higher ripple as now you have less than 6 diodes rectifying. On a better quality and higher output alternators, like balmar, amptech etc, you can see them built into the body, shiny circles with numbers on them, sometimes 3 are marked with red dot and 3 are marked with black dot indicating polarity. There is a great alternator handbook in pdf floating around on the web. URL escapes me. It gives details of all types of alternators. On a cheepo and lower output alternators they might be in a form of an IC. (integrated circuit) The issue is the back emf which all inductive parts have. If your alternator has no place to dump the current and you disconnect the batteries while engine is running, high voltage spikes are generated. If diodes are not specified to withstand these voltages which could be in the order 500V or higher (usually the case with rectifying ICs as they are cheaper and smaller form factor) they tend to fail. Hope that helped clarify what’s going on inside the alternator casing. Petar Horvatic Sundowner 76 C&C 38MkII Newport, RI From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of wwadjo...@aol.com via CnC-List Sent: Friday, August 15, 2014 8:21 AM To: Brad Crawford via CnC-List Subject: Re: Stus-List blown alternator diode The thread on alternators got me to ask myself, "how do you known if you have an internal diode on alternator, and how do you know if "blown?" I am, electrically challenged, admittedly. Bill Walker CnC 36 Sent from my HTC ___ This List is provided by the C&C Photo Album Email address: CnC-List@cnc-list.com To change your list preferences, including unsubscribing -- go bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com
Re: Stus-List blown alternator diode
The most common cause of diode failure on older boats is turning the battery 1-2-all switch while the engine is running. This causes a brief period of no load on the alternator and blows the diodes. Jerry C&C 27 V -Original Message- From: Jack Fitzgerald via CnC-List To: Burt Stratton ; C&CList Sent: Fri, Aug 15, 2014 8:45 am Subject: Re: Stus-List blown alternator diode Also, you will notice that your batteries will discharge much faster than normal when used sail if it is the blocking diodes that have failed as the alternator will become a very large drain. Jack Fitzgerald C&C 39 TM Savannah, GA On Fri, Aug 15, 2014 at 8:36 AM, Burt Stratton via CnC-List wrote: Simple answer: Most do have internal diodes. To be sure you can google the part number of the alternator or look it up on the manufacturers web site. You should see around 13.5 to 14 ish volts across your starting battery terminals when running. It will vary a little depending on the condition of the battery. If you have an ammeter you should see it move to the plus side of zero after starting. If you see 12 or less volts across your starting battery terminals when running or negative amps when running you have a problem with the alternator which could be the voltage regulator or diodes (assuming the belt is not slipping). Skip From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of wwadjo...@aol.com via CnC-List Sent: Friday, August 15, 2014 8:21 AM To: Brad Crawford via CnC-List Subject: Re: Stus-List blown alternator diode The thread on alternators got me to ask myself, "how do you known if you have an internal diode on alternator, and how do you know if "blown?" I am, electrically challenged, admittedly. Bill Walker CnC 36 Sent from my HTC ___ This List is provided by the C&C Photo Album Email address: CnC-List@cnc-list.com To change your list preferences, including unsubscribing -- go bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com ___ This List is provided by the C&C Photo Album Email address: CnC-List@cnc-list.com To change your list preferences, including unsubscribing -- go bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com ___ This List is provided by the C&C Photo Album Email address: CnC-List@cnc-list.com To change your list preferences, including unsubscribing -- go bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com
Re: Stus-List blown alternator diode
Also, you will notice that your batteries will discharge much faster than normal when used sail if it is the blocking diodes that have failed as the alternator will become a very large drain. Jack Fitzgerald C&C 39 TM Savannah, GA On Fri, Aug 15, 2014 at 8:36 AM, Burt Stratton via CnC-List < cnc-list@cnc-list.com> wrote: > Simple answer: > > > > Most do have internal diodes. To be sure you can google the part number of > the alternator or look it up on the manufacturers web site. > > > > You should see around 13.5 to 14 ish volts across your starting battery > terminals when running. It will vary a little depending on the condition of > the battery. If you have an ammeter you should see it move to the plus side > of zero after starting. If you see 12 or less volts across your starting > battery terminals when running or negative amps when running you have a > problem with the alternator which could be the voltage regulator or diodes > (assuming the belt is not slipping). > > > > Skip > > > > *From:* CnC-List [mailto:cnc-list-boun...@cnc-list.com] *On Behalf Of * > wwadjo...@aol.com via CnC-List > *Sent:* Friday, August 15, 2014 8:21 AM > *To:* Brad Crawford via CnC-List > *Subject:* Re: Stus-List blown alternator diode > > > > The thread on alternators got me to ask myself, "how do you known if you > have an internal diode on alternator, and how do you know if "blown?" > > I am, electrically challenged, admittedly. > > Bill Walker > > CnC 36 > > > > > > Sent from my HTC > > > > ___ > This List is provided by the C&C Photo Album > > Email address: > CnC-List@cnc-list.com > To change your list preferences, including unsubscribing -- go bottom of > page at: > http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com > > > ___ This List is provided by the C&C Photo Album Email address: CnC-List@cnc-list.com To change your list preferences, including unsubscribing -- go bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com
Re: Stus-List blown alternator diode
Simple answer: Most do have internal diodes. To be sure you can google the part number of the alternator or look it up on the manufacturers web site. You should see around 13.5 to 14 ish volts across your starting battery terminals when running. It will vary a little depending on the condition of the battery. If you have an ammeter you should see it move to the plus side of zero after starting. If you see 12 or less volts across your starting battery terminals when running or negative amps when running you have a problem with the alternator which could be the voltage regulator or diodes (assuming the belt is not slipping). Skip From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of wwadjo...@aol.com via CnC-List Sent: Friday, August 15, 2014 8:21 AM To: Brad Crawford via CnC-List Subject: Re: Stus-List blown alternator diode The thread on alternators got me to ask myself, "how do you known if you have an internal diode on alternator, and how do you know if "blown?" I am, electrically challenged, admittedly. Bill Walker CnC 36 Sent from my HTC ___ This List is provided by the C&C Photo Album Email address: CnC-List@cnc-list.com To change your list preferences, including unsubscribing -- go bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com
Re: Stus-List blown alternator diode
The thread on alternators got me to ask myself, "how do you known if you have an internal diode on alternator, and how do you know if "blown?" I am, electrically challenged, admittedly. Bill Walker CnC 36 Sent from my HTC ___ This List is provided by the C&C Photo Album Email address: CnC-List@cnc-list.com To change your list preferences, including unsubscribing -- go bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com
