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

11,880

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

4 of 4 people found this helpful.
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.

Your Answer

Hummer H3 Experts

  • #1
    cocod
    Reputation
    820
  • #2
    HummerGirl
    Reputation
    800
  • #3
    PatriciaDoss
    Reputation
    610
View All

Related Models For Sale

Used Hummer H2
28 Great Deals out of 1,273 listings starting at $8,900
Used Hummer H2 SUT
5 Great Deals out of 236 listings starting at $13,790
Used Hummer H3T
46 listings starting at $16,991
Used Jeep Wrangler
294 Great Deals out of 16,176 listings starting at $2,500
Used Jeep Wrangler Unlimited
346 Great Deals out of 41,512 listings starting at $8,995
Used Ford F-150
2,318 Great Deals out of 182,094 listings starting at $1,000
Used Chevrolet Tahoe
664 Great Deals out of 39,394 listings starting at $1,000
Used Toyota FJ Cruiser
76 Great Deals out of 2,103 listings starting at $6,995
Used Chevrolet Silverado 1500
2,144 Great Deals out of 167,073 listings starting at $1,498
Used Toyota 4Runner
290 Great Deals out of 21,637 listings starting at $1,700
Used Jeep Grand Cherokee
896 Great Deals out of 70,389 listings starting at $1,045
Used Cadillac Escalade
215 Great Deals out of 11,079 listings starting at $2,000
Used Toyota Tacoma
605 Great Deals out of 42,669 listings starting at $1,500

Used Cars For Sale

2009 Hummer H3 Alpha For Sale
7 listings starting at $12,990
2008 Hummer H3 Alpha For Sale
68 listings starting at $10,577

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.