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Old 12-04-2015, 18:06   #1
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Join Date: Jun 2009
Location: still in a roll of fiberglass around Cape Town
Boat: Leopard 40 (new model)
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Ground for Hitachi alternator on a Yanmar

Hello everyone
I am looking for detailed info on what is the proper way to tie this alternators to battery negative. In the standard setup I see on Moorings boats, the battrry negative is tied to a cable coming from the front/starboard part of the alternator that (once internal reg hits its voltage cutoff) is 13.7V away from the BAT terminal in the back of the alternator.
I wonder why don't they use the (so far unused) unlabeled terminal in the back, about 1 inch away from the BAT terminals, which is nice 14.2 volts away from BAT.

I would appreciate any insights.

Charlie



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Old 12-04-2015, 18:49   #2
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Re: Ground for Hitachi alternator on a Yanmar

gernally on smaller alts (80a and less) there is no ground wire. it's a metal alternator bolted to a metal engine. which is grounded.


I don't understand your voltage numbers. you should be reading the same voltage anwhere on the alt case, engine ground, battery ground ect.
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