Thor Forums

[gmc]

Originally Posted by Dennisday

GMC,door locks won't work,no tail lights,no headlights.for a short time it came back on.drove it then parked n it all went out again

OK.. description changing a lot from 'Won't go out of park(gear shift) n no headlights'.

Sounds like everything at issue so far is on the chassis side - so focus there... I assume it won't start now based on other things not working? (Or at least won't start if the headlights/taillights/etc aren't working at the time...)

Hard to diagnose from distance - but my initial thought would be battery... A battery that won't accept/hold a charge could behave like that (had a U-Haul truck 2 months ago do exactly that halfway through 1000 mile trip... till they replaced the battery.)
May read 12+ volts with no load - but any load will drag it down. Even managed to get it started to drive a bit further - until I shut it off again.

Does Emergency Start switch help? (a very dead battery may not be...)
Sounds like you were camping when it failed?
How long ago did you drive it (aside from what you just mentioned)?
Plugged into shore power?