Quote:
Originally Posted by x98boardwell
Update:
Put the old alternator in from a spare 3.2 and worked perfectly... No idea why an alternator would be rebuilt and work on the bench but not in the car.
Question: Is there a way when the alternator is rebuilt that the output from the exciter wire or voltage regulator is different where it won't communicate with the dash to trigger the alternator to start working..? Seems odd but it's fixed. Now to take alternator back to shop who rebuilt it and ether have them do it again or get my $$ back..
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There's a factory advisory that you might need to fit a resistor to drive the exciter circuit hard enough to work on older cars updated with newer bits. One possibility. It's both mentioned and reproduced in this thread:
https://forums.pelicanparts.com/porsche-911-technical-forum/989178-electrical-wizard-help-needed-alternator-light.html