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It doesn't sound like anything is wrong with the alternator, at least not the 'generating' portion, as I believe it has the 'internal' regulator. The regulator 'module' may be bad, but I suspect wornout brushes, and have seen your same symptoms in a case of worn brushes, twice!
It is a bit of a pain to remove your alternator, but I think the problem is there, and therefore it needs to be taken out for testing/repair. If you can find a shop specializing in motors and alternators, take it there for testing and rebuild. I wouldn't recommend replacement with another unit, because that WILL be expensive, and rebuilding can usually be done for $100 or mabe a little less.
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Warren Hall
1973 911S Targa
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