Alternator voltage flucuation, 1997 4.3 Merc - Maxum Boat Owners Club

Milt P. · 07-19-2010, 12:53 AM

When running the volt meter is at 12 volts, at idle it is 13 volts and sometimes bounces between 12 and 13. How do I trouble shoot this?

seapuppy · 07-19-2010, 02:23 AM

sounds like the voltage regulator is taking a dump on you..take the alt. off and to a local auto parts store..they can test it really easily...and for free.

SP

Milt P. · 07-19-2010, 11:38 PM

I'm hoping this is because the battery is charged well. Every since I added the house battery the starboard battery only has to start the engine. The engine turns over very easy. Can I check with a meter at the alternator.

Diggman33 · 07-26-2010, 02:50 PM

Hi - Any word on this? Im experiencing something similar... voltage bounces from 14v to 12v periodically. Particularly noticable when a bassy song is on the radio, but occurs with the radio off as well.

SWIFTSCR · 09-22-2010, 04:57 PM

also check that you have 8volt feed to the alternator to control the voltage regulator. Should come on and off with ignition swt.