Thought it was a simple dead battery but engine still won't turn over. All interior lights, instrument panel, radio, etc.. work normally but when I turn key to start it the entire instrument panel and all items mentioned above go off. I can hear a low click under the hood but thats it. Any ideas?
It sounds like you have a bad connection on the battery. Make sure to clean the connections, make sure they are tight, and make sure the ground cable has a good connection at both ends, battery side and body/frame side. The bad connection is the only answer when the battery is fully charged and you turn the key and it all goes out. If you can turn on your headlights and press the brake at the same time, and they work, then it may be something else, but I would be amazed if they do work given your description of your problem.
So, make sure the battery is charged and clean and tighten all your connections. Test battery connection by putting it under a load with all the lights, head, and brake at the same time. If it goes off then, redo cables again.
Good luck.
SOURCE: 2007 yukon xl battery dead recharged battery will
We had the same issue with our 2007 Yukon Denali XL. Died on us twice after sitting for short periods of time; once we watched a DVD with the engine off and battery died within 10 minutes. The dealership kept it overnight to troubleshoot why the battery died so quickly. They said the radio was "pulling" too much from the battery. (They supposably fixed it) But again a few days later the battery died again after sitting overnight. We brought it back to the dealership and they brought in a GMC "expert" to replace the entire DVD/CD/Navigation system. They also replaced our battery with a much larger battery, similar to the ones that GMC puts in there diesel trucks. They had our Denali for 5 days, but it appears to be fixed now.
Getting it fixed correctly wasn't without headaches, but it was all covered under warranty, including the battery. And they are updating the nav w/ the new edition disc as well for no charge.
SOURCE: The Heater fan in my 2003 GMC Yukon XL will not turn off
I don't know if you already fixed it, but I had the same problem on my 03 yukon, TysonRicky is right. In my case it was the blower control module. You can find it right under the glovebox. It cost me close to $100 for a new one, but very easy to replace. Can't even imagine how much it would've cost me if I had a mechanic do it.
SOURCE: 2003 GMC Yukon XL All gauges on instrument panel stopped working
I had to replace the entire instrument cluster. It was covered by the warranty.
SOURCE: 2003 GMC Yukon XL All gauges on instrument panel
Sounds as though u have experience the GM usual cluster failure. They go bad more often then probably any other vehicle. Gm has been replacing some under a goodwill warranty for some customers.
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