when is an alternator considered bad?

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when is an alternator considered bad?

08-13-2000, 12:59 PM

roland

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I just changed my W123's battery. The voltage of the batt is okay at 12.4-12.5.

but with the engine at idle, the voltage drops to about 12.1! And on revving, it goes up to about 13.1.

Is the alternator is on its way out? has it anything to do with the voltage regulator? thanks.

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