Checking Alternator

dunga

Cadet
Joined
Apr 23, 2004
Messages
13
What is the best way to check to see if your alternator is working?
 

rattana

Chief Petty Officer
Joined
Jun 12, 2003
Messages
413
Re: Checking Alternator

Measure the voltage at the battery when running. It should be 12.4 volts +/- 0.1 volt when engine is off. It should be about 13.5-13.9 volts when engine is running at 1500 RPM
 

Boatist

Rear Admiral
Joined
Apr 22, 2002
Messages
4,552
Re: Checking Alternator

Dunga<br />Agree with the voltmeter. Battery voltage 12.6 volts at 70 degrees. Charging voltage from alternator 13.8 to 14.8 volts from 1000rpms and up.
 
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