Well, the idiot light signifies no alternator output, but whether it is the brushes, or regulator section, or bad winding, etc. is hard to say. I would recommend removing the alternator from the engine. Take it to a shop specializing in motor.generator/alternator repairs, and they will be able to test and diagnose it properly. Charges to have one rebuilt generally run around $100, versus $300+ to get an exchange ubit.
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Warren Hall
1973 911S Targa
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