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I've watched the battery voltage on road trips and the voltage goes up/down regularly. I can't remember exactly but when the voltage gets to about 12.5, the alternator start charging until about 14.1 (I think). The voltage will then slowly drop until 12.5 and repeat process.
I guess this is normal? Maybe a voltage regulator in alternator?
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2011 Summit White Camaro 1SS/RS
-6.2 LS3, TR6060, 3.45, G80
2004 Black Silverado 1500 2WD Regular Cab, Short Bed
-5.3 LM7, 4L60E, 3.42, G80
2014 White Caprice PPV
-6.0 L77, 6L80E, 2.92, G80
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