Question about 2004 Chevrolet Silverado 3500

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My silverado 3500 01 battery keeps going

My silverado 3500 01 battery keeps going dead,battery is brand new interstate battery and alternator has been checked twice all passed,amp meter is reading low though reads about 9 amps or so , confused Paul

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Ck the charge rate at the battery posts. The proper range is 23.6 to 14.2v , The higher the voltage the llower the amps. Ie; at 13v Alternator is about 10% under capacity. @ 12v it is charging at max capacity. @ 15 v isthe alt is not charging but frying your battery. 9amps is ok if battery is fairly charged but at start up it should sit on 13-13.6 volts. for about 15 seconds the start climbing to less charge towards 14.2.

Posted on Oct 15, 2009

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