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Old 06-09-2007, 08:12 AM   #8
FrayAdjacent
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Join Date: Dec 2006
Location: Austin, TX
Posts: 939
If you suspect a faulty alternator, get a good battery in there, start the engine, and check the voltage across the battery. At idle it should be around 14v. If it's 12 or less... you could have a bum alternator.
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