I Have A 07’ Yukon SLT. And I been Having battery drainage problems lately.. it will be working Fine than one minute I while get back in it to drive and it will be Dead! Get a jump, it comes back on and be fine for weeks than one day it just dies again? Not sure what’s wrong? But what I did find out is that the owner before me had Speakers hooked up and the loose Wirer's are still running under my seats and in my truck the other end of the wiRers that ran to the speaker is just thier live wirers with nothing hooked to it? Could that possibly be why the battery is seen tobe draining and if So what could I do to fix it, or either how could I disconnect the wirers from the battery running live under my seats???

Did you find the fix?? My 08 Yukon doing same thing. Very frustrating

My 2007 was doing the same. The was a bad positive battery cable, acid had eaten it up half way down the cord.

My 07 Denali XL with 6.2L was draining battery and also affected starting. Finally wouldn’t start. Replaced starter and now no start problems and no more battery issues. Starter solenoid appeared to have intermittent short when ignition was on draining battery. Not sure if this is your problem but you can take starter to repair shop for testing...

I have a 2006 yukon denali that I just resolved a battery drain issue by unplugging the 6 disk changer fuse. The disk changer was constantly trying to eject disk 2 for whatever reason. I also pulled the rear entertainment function which solved another issue ( how to disable OnStar) where OnStar kept telling me "phone not found" at seemingly random times (very naggy). The good thing about having a model with 600 features options is that is you end up disabling 2 you still have 598 :)