GMC Troubleshooting Questions? Ask a Mechanic for Answers
I am sorry your having this problem
do you have any access to a good multi meter ?
all of those things not working run off the trans fuse
if you unplug the big electrical connector at the transmission passenger side front next to where the 2 transmission cooler lines connect into the transmission will that fuse still blow ?
how are you making out ?
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ok if that fuse stops blowing with the transmission unplugged then there is a solenoid shorted under the pan or the wiring harness is shorted under the pan
those are the only things that will blow that fuse
the pan needs to come off and the wires checked under the pan
more than likely no
usually when these backfire there is a distributor failure or a bad cap and rotor