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Registered User
Join Date: Apr 2014
Posts: 4
Porsche Crest alternator

please help, I changed the alternator and battery, there are both new and the battery is still not charging what cloud be the problem. does it need a ground the alternator.

Old 04-04-2014, 05:20 AM
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Registered User
Join Date: Oct 2002
Location: Boulder, CO
Posts: 807
No need for a ground. Any problems with the gauge cluster? If the warning light for the charging system is not in-circuit I think you lose the power that excites the alternator field.

Do you have power at the smaller post (D+) with the key on? If not you can jumper that and see if you start charging. Careful though if it's shorted you might get some sparks so don't use a piece of coathanger wire.


1987 928S4
1992 968 cabrio
1994 968 cabrio - Supercharged
Old 04-04-2014, 05:51 AM
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