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Old 12-22-2016, 12:15 PM   #2
JFP in PA
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Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,614
Most likely, it is the voltage regulator inside the alternator. While Porsche does not sell the regulator separately, just about everyone else does (it is common to VW, Ford, MB and other makes), so you can get one at a reasonable price.
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