H3 Dead in driveway - 3rd time now

[ROADNOTCA]

Originally Posted by RubHer Yellow Ducky

NOW that is neat...

I wonder what gauge wire you need to run from the battery
RYD

I'm using them on my 1985 Suburban, leaky circuits and all. I splice them into/interupt the battery ground, same thing as disabling a battery for any electrical work. I have two batteries as I want to eventually weld with 24V. Plus I have a way to disco one battery when camping so I'll always have a battery to start-up at the end of the trip. Using a switch just saves wear-n-tear on the battery terminal clamps.

[cmeinck]

I'm not sure exactly what they told me, but assured me it was not connected to anything that would cause battery drain. I confirmed this with the Hummer dealer. Again, I forget where it's wired, but it's not powered up until the truck is started. Hummer kept the truck for 3-4 days before returning at GM's request. I've had it back for a few weeks without a problem. I even got a call this week to see how things were with the truck. That never happened before.

This problem was occuring BEFORE the TVs.

[cmeinck]

Well, it happened again last night. I got into the truck and click,click,click. No start. I'm so frustrated with this truck. Calling GM, then roadside assistance yet again.

[K9sH3]

I hope mine doesn't start this. When I flew back in and got to my 3 it was dead as crap. no click no nothing!
Is there anyway to test to see if there is power running, how much and from where?
The only thing I had on was the radar detector and the two lil lights for the "offroad lights" switches.

[cmeinck]

I called GM direct and told them I didn't want the truck. The way I see it, this is the 5th time for the same problem, fourth time the dealer has had the truck for this issue (first time they suggested I call roadside for a jump). It's got barely 8000 miles, so this truck is clearly problematic. Dealership was helpful. They simply pass the info to GM who reviews the case. A quick look at my roadside assistance history would show the problem(s).

I'll keep you updated. Truck has been towed to the dealer today.

[Desert Dan]

cmeinck

I don't blame you.

A dead truck can equal a dead owner depending on where you travel. Winter or Summer.

Reliability in #1 in my book.

[Hunner]

Way back there somewhere there was talk of the BCM and it being new or programmed to a specific vehicle. I thought it was a bunch of fuses and relays. Is there some ROM in there or something to program??
I also read about someone else installing the roof lights. I also had a problem getting the BCM to engage with the plugs under it. I found out how to lock them up before installing it. When I did put it in but not fully engaged I got all kinds of weird things going on. I wonder if that could still be part of this problem. If any one of those leads into those huge connectors is pushed out of contact or pinched and shorting to another one it could cause this. It could even be a shorted relay or one that hangs. It looks like installing a temporary amp meter in line with the battery would show if there was any drain while the system is off. I guess it would have to be a sensitive digital to be accurate. I would think the dealer would know what is supposed to be the draw on the PCM when off and maybe the alarm. Then check for any additional draw. Then of course it could be aliens. Do you park under large power lines are live next to a large deposit of iron ore?? It is probably a pulled stripped wire somewhere that would be good training for GM techs to figure out on there own time back in Detroit!! Sorry you are having this problem.