Alternator/Charging Question

burtonrider11

Petty Officer 2nd Class
Joined
Jul 28, 2005
Messages
178
Hoping someone can enlighten as to whether I have a potential problem brewing. I have noticed in just the past couple of times out, when idling, our battery(s) don't seem to be charging. Volt meter is low and hitting the trim button causes a precipitous drop in RPM and Volt metter. As soon as I hit about 1500 RPM's you can see the volt meter jump up to where it should be. It will then continue to charge while on plane or back to no wake speed. I have two batteries and it doesn't seem to matter which battery I have switched onto, same thing.

Really hoping this isn't an alternator issue....

Engine specs:
1997 Mercruiser 5.7l 2barrel V8, Alpha Drive

I am wondering perhaps if there is some corrosion in the contacts within the alternator and it just has to get spinning faster? Any insight would be especially appreciated!
 

Bt Doctur

Supreme Mariner
Joined
Aug 29, 2004
Messages
19,365
how many wires are on the alt? The "Single wire" does act like that
 

Bondo

Moderator
Staff member
Joined
Apr 17, 2002
Messages
71,148
Ayuh,... Most alternators don't charge til the 1st time Rev'ed after a start,.....
 
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