Question about 2004 Hummer H2

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Since the Altenator is run off a serpentine belt with an auto tensioner, this may not be the issue, although an old, stretched out belt could be the issue. If it's the original battery it may need changed or the altenator may be failing. Both of these can be tested for free at a local parts store, like Autozone, and I think they can do it while still on the vehicle.

Posted on Jan 13, 2009


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My 25 year old hilux surf keeps draining the batteries, ive had the alternator checked, now the dors wont open with the fob, can i unlock using the key in the lock without the alarm going off an annoying...

Change the battery in the fob first something draining the battery? or not charging the battery? Two separate questions.....

Check all fuses and relays, check all electrical connections, especially at the alternator..check for broken or corroded connections...check the tensioner on the drive belts...what is the condition of the battery? Is it holding a charge?

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3.5 amp wont drain a battery over night nor in a week i'm assuming you have at least a 500CCA battery here.

battery's don't drain like that, they do loose power once they have a bad cell, or the battery water is low. I'm assuming you had it tested here by a technician from the battery shop and that's what they told you and its a new battery or relatively new..

to test this your self you can take the battery out of the vehicle and leave it outside over night, you will see the power is drained out and it wasn't connected to anything. Thats because of the bad cell..

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My 99 saturn. my battery gets drained. my belt that is the tensioners belt got loose it didnt break or anything. and i got a new batteru and it kept draining the battery. i jumped started and it would...

if you have an autozone,they will put it on the computer for free.if you don't,call around some parts stores and see if they should change the belt instead of shortening it.sounds like the alternator though.have a shop check the tensioner too.

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The belt should not be stretching this soon. From what you say about the alt light lighting up every morning and thie belt making noise. this leads me to belive that for some reason your alt is going to full output first thing to make up for a low battery. So either you have a drain on the battery overnight due to something not shutting off at night, or your battery is going dead. Both of these conditions would make the alt have to work extra hard first thing in the morning, wich could put a strain on the belt causing it to stretch on you. I would take it back to the shop and have both your alt and battery checked before worring about the belt. Other than that, the shop that put your belt on should adjust this for free if they didn't get it right the first time and tighten everthing back down as they should have.

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