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well you forgot that the alternator is usually regulated to a higher voltage than the nominal battery voltage (or else it wouldn't be able to charge the battery), and typically the alt. output is at about 14V. The voltage across the battery will be approximately equal to the alternator output voltage when the car is running, and there will be a current running "backwards" through the battery as it charges.
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Come on fhqwhgads. I see you jockin' me. Tryin' to play like... you know me...
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