HOW TO CHECK AN ALTERNATOR

  • Tiny
  • Anonymous
  • 1999 Holden Commodore
  • 300,000 miles

How to check an alternator

Saturday, February 2nd, 2013 AT 11:47 PM

1 Answer

  • Tiny
  • mhpautos
  • Expert
  • 29,864 posts

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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Saturday, February 2nd, 2013 AT 11:52 PM

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