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Like filou said - very good change (like 95%) its your voltage regulator. I had the exact same problem. I'll bet your seat belt warning light comes on, too.
The regulator is on the back of your alternator. Pull it out, remove the regulator, install new one, done. 2 hour job for me the first time. If you like to swear, you'll find it comes in handy getting the alternator out of the housing.
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Chris M
1985 911 Carrera w/ 3.6
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