Quote:
Originally Posted by alm001
I've had a problem over the last two weeks that I initially thought was my battery.
I popped the cover, and put a meter on the terminals and it was showing 12.5v with the car running at idle. I didn't bother the wife with revving it up to check, and I just parked the car to deal with later. Never had a battery light come on.
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With the engine running above 1000rpm, you should see a 13.5 - 14.2v (depending on the battery state of charge) @ the battery terminals. Anything lower than that and the charging system is suspect.
Deciding if the problem is a faulty alternator or a voltage regulator will require a bench test of the alternator.