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TOPIC: House Bty - 3988 Not charging from alternator

House Bty - 3988 Not charging from alternator 09 Sep 2017 12:37 #1

  • Checks Five-Oh
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From what I understand, the stbd alt. charges the house bty. Meter shows alternator is doing it's job from the volt meter while above 1200 rpm, however, I am not convinced that the alternator is charging the house battery.

I would think that there is a wire going from the alternator directly to the house battery, is this correct?

Thanks for any help.

Checks

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House Bty - 3988 Not charging from alternator 09 Sep 2017 12:43 #2

  • Norton Rider
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Moved to Motor Yacht section.
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1999 3788, Cummins 270 "Freedom"
2013 Boston Whaler 130 SS
Anacortes, WA

House Bty - 3988 Not charging from alternator 09 Sep 2017 16:03 #3

  • The Other Gary
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The original build was a battery isolator mounted on the starboard engine starboard stringer. A Previous owner may have upgraded this to a battery combiner.
You first need to access this to see what you have. Access is through the panel at the rear of the water heater compartment.
If you have an isolator it may be pooched and need a replacement. A battery combiner is more efficient in terms of line loss.
If you have a battery combiner it has a small black ground wire that must be connected to a negative battery terminal to operate. Follow the black wire and make sure it has not been disconnected at some point.
Let us know what you find.

Isolator

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combiner

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"Adios Dinero"
1997 3988 with new 330 Cummins
Photo Credit: Whiskywizard
Last Edit: by The Other Gary.

House Bty - 3988 Not charging from alternator 09 Sep 2017 21:40 #4

  • Checks Five-Oh
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Thanks Gary, I will take a look next weekend when I am at the boat and let you know. I do remember seeing the negative wire you are talking about, now I need to trace it back. Cheers

J

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