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Battery not charging 200 1991

I started my car this morning, and the battery, parking brake and brake failure warning bulbs were very dim. I put a meter on the battery and I'm getting 12 volts. Revving up the engine does not help. I have 12.4 volts with the engine off, so I think the battery is fine. According to my Bentley, it tells me to repair wiring or bulb faults before continuing. I don't think this is the problem. I think I have a voltage regulator problem. I removed it and it was full of crud. Cleaned it up and the brushes are about .125. It says to change them below .2. Looking at the schematic, the SRS light and my turn signal indicator lamps should be out. The SRS light is out, but the turn signals work.

Can I just change the brushes on the voltage regulator, or do I have to replace it completely. Am I barking up the right tree? Thanks so much.
--
Ed 89 740 176K, 91 240 210K






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