TwinTurbo.NET: Nissan 300ZX forum - 12.8 is not low...12.65 is considered "perfect"
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Subject 12.8 is not low...12.65 is considered "perfect"
     
Posted by BobbyT on June 25, 2008 at 2:35 PM
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In Reply To car won't start - advice? posted by John B on June 25, 2008 at 12:32 PM
     
Message My couple-month-old battery shows mid 12s iirc.
You may be thinking of voltage with the car on, because the alternator puts out a higher voltage to keep the battery topped off (14.4 is "perfect"; high 13s is fine).

That also explains your 14 volts while jumping...the other car was running so its alternator was holding its and your battery at 14.

     
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