Wiring diagram or fuse box diagram-2007 GMC Envoy Denali
I need a wiring diagram or fuse box diagram for 2007 GMC Envoy Denali trailer towing package problem. It's a 7 wire auxillary plug. The trailer brakes work fine, but all the lights do not come on. I don't know if it is a fuse or in the wiring. If it is a fuse, I need to know which one.
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The T PARK fuse in the rear fuse-relay block supplies battery positive voltage to a separate park lamp circuit connected to the trailer wiring harness..
For trailer wiring, separate turn signal circuits are connected through the GMSF to the trailer wiring harness.
Fuse Block - Rear
Beneath the left rear seat
Trailer TR/PARK fuse 42 10amp
If front park lights are working highly unlikely headlight switch is the issue. Is the vehicle equipped with a trailer towing package and wiring to the rear? I would start there. This vehicle may also have a taillight module located under the vehicle on the passenger rear attached in the wheel well area that goes bad
look goto autozone they have a all in connector for towing so much me easer about 40 dollars you go back to driver side rear harnes when you unplug it the pig tail joins all connectors to geather along with your traller pig tail no mus no fus
ok tdknutson, I'm not clear on this, does the truck left turn signal stop working when u plug the trailer in, or is it the trailer left turn signal that's not working, or both? When u plugged in the test light did it show u had power to that plug in? Let me know the answer to the above, and in the meantime, check the ground on the turn signal at the trailer. Make sure it's not loose, and tightly connected to the frame (or wire). Also, what type plug in do u have? 4, 6, 7 wire?