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Re: The Alternator Light, what does it mean when...[200/1989] posted by abe crombie on
Sunday, 17 December 2000, at 11:51 a.m.
The brushes being worn won't make the light be on with key off. This condition requires a backfeed of current through the circuit where no current flow will exist with key off if no problem is evident.
Worn brushes can make for a dim light with engine running as can defective diodes in alternator.