Posted by George Marsh on January 05, 2012 at 16:02:16 from (50.104.233.8):
I bought my 2007 GMC truck new. It now has 42,000 miles. Was told by the dealer my battery has a full charge and failed the load test. I can charge up the battery, let is sit for 24 hours. It produces 13.2 volts and 11.2 volts under a 100 amp load test. Bought a new battery. Charged it up because I didn't know how long the battery had sit on the store shelf. It too produces the same results 24 hours after removing the charger, 13.2 v and 11.2 v under load.
Been watching the voltmeter on the dash. About 1/2 way home, the truck's voltmeter drops to 12.5 volts. By the time I get home, sure enough the battery's voltage is 12.5v and it fails the load test.
I installed a new battery tonight. I think there is something wrong with the alternator or the voltage regulator. All the wires look like they did when the truck was new. No oxidation on any thing. Belt has no cracks and doesn't squeak. The dr44g gmc alternator is a 240 amp alternator and it's expensive. If the problem continues I'll replace voltage regulator.
Has anyone experienced a similar problem with the 240 amp alternator? George
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