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Registered
Join Date: Oct 2006
Location: Paso Robles, CA
Posts: 376
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Battery should read 12.5-13v with car not running. With engine running and rpms above 3k you should see more than 14v at the battery. If you see less volts than with the car running that not running then your charging system is drawing from the battery a definite sign it isn't charging. This is standard for any 12v engine. I am not particularly familiar with Porsche charging system so I can't get very specific on where to go from there, but usually check for loose battery cables, voltage regulator, then alternator. Someone correct me if I am wrong.
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1981 911sc RoW Coupe (forever under 3.6L conversion)
2003 996TT Basalt black
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