2008 GMC Yukon Denili

[Burkard]

Im having problems with my rear driver side brake lights and the turn signal. I believe its a bad ground. Ive replaced the bulbs. Still same problem. The lights work when running lights are on, push brakes nothing. Then when you turn left blinker on all three light blink dimly. Including the reverse light and the reverse light on right side blinks also. Ive cleaned the ground wires near the rear on the yukon the are mounted to frame on drivers side near where the spare tire is. Wondering if there was a way to get a wiring diagram I can get. This weekend I'm gonna drop the spare tire due to the wires run up along the body underneath the spare. Don't know if the previous owner did any modifications to them. Or maybe when he replace the charcoal canstear he niked a wire. If anyone has any other ideas I would appreciate them. Thanks and god bless you'll

 

[Joseph Garcia]

Did you inspect the bulb sockets themselves, to ensure that the contact surfaces are clean and well connected to the wires entering the sockets?

 

[Doubeleive]

pull the bulbs first and clean the sockets real good with a screwdriver and piece of sandpaper, if that doesn't help then go to the gmupfitter guide for wiring info

 

[CaptainAmerica1]

Trailer light wiring?

 

[Rocket Man]

Have you checked the contacts where the harnesses plug into the junction block under the rear by the spare? They can get corroded.

 

[Burkard]

Did you inspect the bulb sockets themselves, to ensure that the contact surfaces are clean and well connected to the wires entering the sockets?

Good suggestion. Thanks I will start there

 

[Burkard]

Trailer light wiring?

I checked them. I thought that is where the problem was, because when I bought it and drove it home I could smell burning rubber. So I found where smell was coming. Damn trailer lights weren't mounted to frame or body and was laying on muffler. So I pulled the plastic covering off the wires. To my surprise it only melted the plastic covering didn't burn through any of the wires. I made sure with a Volt meter.

 

[Burkard]

Have you checked the contacts where the harnesses plug into the junction block under the rear by the spare? They can get corroded.

No. Thank u I will check out that. Thanks.