HOW TO CHECK AN ALTERNATOR

1999 Holden Commodore

Tiny

Anonymous

February, 2, 2013 AT 11:47 PM

How to check an alternator

FOUND 4351 RELATED QUESTIONS

My Alternator Quit Charging

22 ANSWERS
31 IMAGES

Charging System Trouble

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5 IMAGES

1 Answer

Tiny

mhpautos

February, 2, 2013 AT 11:52 PM

Use a multi meter and with it set on 24V or any setting above 16V probe main alternator wire with red lead(+) and place black lead(-) to a good ground you should have around 14.5 volts at a fast idle speed. Do not remove battery terminal while engine is running as you will get a voltage spike and possibly destroy the main ECU.

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