Question about 2002 Volkswagen Passat

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'alternator Workshop!' warning along with the battery light keep popping up. The battery is good and the alternator seems to be working correctly. What else can this be?

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If the voltage regulator is charging too high or too low or one or more of the diodes in the diode trio are burnt out and not functioning, the battery or alternator light will pop up.

This indicates that the charging system has something amiss, unfortunately.

Posted on Jul 08, 2010

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1. The battery warning. This is indicative of a weak battery and if your battery is 3 years old or more I would replace it.

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