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
<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
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