Need advice on an electrical drain on battery

5

Asked by Nov 27, 2014 at 01:34 PM about the 2008 Hummer H3 Alpha

Question type: Maintenance & Repair

I'm having battery problems, I've taken the vehicle to 2 dealers for repair all they do is
charge  me about 350 to 400 dollars. they say the problem is intermittent, I've done some testing myself. the battery voltage goes from 12.68 volts to 10.57 volts over night, now I have to leave it on a trickle charge, I suspect a faulty ECM, please what is your opinion thanks walt wolford brookings oregon.

2 Answers

13,500

check for engine codes, and go to youtube and watch a vid on how to test for a parasitic draw in your car.

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Best Answer Mark helpful

a good car battery will have 2.2 volts per cell or a total of 13.2V on a "12 volt" battery. dead cells will cause lower voltages like 10.7, etc. when charging the alternater pushes electricity backward into the battery and its internal resistance will cause the voltage to go higher, into the 15V range when the engine is running.

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