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Demans sucking my H2's Life
I know this has been discussed before, but I have not seen anyone post an answer to the mystery.
If I leave my H2 for a week without starting it, the battery goes completely dead. Anybody have any ideas? |
Re: Demans sucking my H2's Life
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I had the same problem with my H2 and it's even worse with my H3. After trying different batteries and cables I installed a CTEK charger. I have it plugged in whenever I'm not driving it. It works great, no more problems!
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Re: Demans sucking my H2's Life
Now thats an idea but what a pain. I may have to resort to this, but I wish I could just fix the issue.
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Re: Demans sucking my H2's Life
Had the same problem over a year ago. what a pain in the azz it was. My truck was at dealer for about 3 wks to figure it out and GM/Hummer sent people down to figure it out. About once a week in the middle of night, something would turn on and run at about 300amps just killing the battery in a minute. I posted on here about while it was at dealer and got a lot of help from everyone. I used the ideas i got to give to GM. Sadly they couldn?t figure out exactly what was turning on ! They had all this equipment on it (looked cool) and still couldn?t figure it out. So they completely reflashed all the computers (after i gave them the idea) PCM/BCM/TCM/ onstar update, radio, etc and it worked! No problem since! I did install an OPTIMA D31A since i wasn?t crazy about my battery being drained tons of times by the dealer and not replacing it saying it was fine. So i was like whatever, ill go get a bad azz battery. Got it for 190 shipped to my door with coupon from advanced autoparts.
COMMERCIAL YELLOWTOP DUAL PURPOSE BATTERIES MODEL NUMBER D31A & D31T PERFORMANCE Voltage 12V Cold Cranking Amps @ 0 F 900 Cranking Amps @ 32 F 1125 Reserve Capacity 155 Capacity (C/20 rate) 75 Internal Resistance (ohms) 0.0025 PHYSICAL SPECS Length 12-13/16" Width 6-1/2" Height 9-3/8" Minimum Weight (lb) 59.8 Type/Post Terminal 3/8" Stainless Steel Stud & SAE Post BCI Group 31A & 31T |
Re: Demans sucking my H2's Life
Is your onstar system active? If not try pulling the info fuse and try it. When you dont have an onstar subscription sometimes the module will wake up randomly and attempt to find a sat signal.
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Re: Demans sucking my H2's Life
I pulled the OnStar fuse along time and it has done nothing for.
My problem is I am in Germany and there is no deler support for me. There is a guy near by who could do it but at my cost. |
Re: Demans sucking my H2's Life
So I got a chance to do some testing this weekend and found the following:
Under the hood fuse box TBC Bat - 140MA IPC/DIC - 330MA HVAC - 130MA SEO B1 - 330MA TREC - 20MA Inside Fuse box DDM - 45MA I took each fuse out one by one and read the amps across the fuse terminals. Based on the figures above does anyone have any ideas of where to begin my troubleshooting. I am just getting sick of buying batteries for the Hummer. |
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