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Old 06-22-2003, 10:00 PM
Greg in Oz Greg in Oz is offline
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Join Date: Jan 2003
Location: Sydney, Australia
Posts: 627
Originally posted by Botnst
Using my VOM, I get about 12.5 volts at idle but don't know about amps, no ammeter and I don't recall exactly how to make a shunt...its been 30 years since I worked with electricity.

Is there a way to determine for sure whether my problem is the alternator?

Thanks for your guidance.

12.5 volts is about what you should see without the engine running. At idle, unless there is a heavy load, I would consider this too low. Check it with the engine at higher revs. If you can't get at least 13.8 volts you have a problem and will never fully charge your battery.
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