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Check fuses, check bulbs, check connections.
If the 2004 GMC Envoy came with a tow package, then there should be a trailer brake controller harness. It would be located up under the dash near the brake pedal.
The brake controller wiring harness connector for the 2005 GMC Envoy is located under the dash on the driver's side of the vehicle. Look for a connector plug not connected to anything, next to the hood release latch.
under the hood in the fuse panel top left may have a red dummy fuse if the trailer brake wire harness wasn't installed
The rear bumper on a 2005 GMC Sierra 1500 is changed by removing the wiring to the trailer hitch and license plate. The retaining bolts can then be removed and the bumper lowered from the frame.
6.5" for all four doors. Get a mounting harness for the speakers as well
check the fuse in the underhood fuse box. There are separate fuses for the trailer turn circuits and tail lights. If the fuse is burnt, replace and reconnect the trailer. If the fuse blows again, check the trailer wiring for a short on the park light wire.
If there is a trailer wiring harness on the vehicle for towing unplug harness under drivers side rear tail light to eliminate the trailer wiring that's probably the issue then plug factory wires together
Bad BulbBulb socket corroded & shortingBad Harness and/or wiring & shortingIf you have a trailer hitch harness, check that tooCheck license plate light (sometimes on same circuit)For bulb information see sources and related links below.
Troubleshooting 1997 GMC Van brake light / headlight issue (check in this order): · Check Fuses · Check Bulbs · Check Relay(s) · Check Light Switch(es) · Check license plate light bulb and wiring · Check trailer hitch wiring harness · Check all wiring harnesses and wire Most likely its the fuse or a burnt bulb breaking the circuit. Sometimes the license plate and/or the trailer hitch is wired into other circuits and can cause issues in other areas. Sometimes its wires grounding out somewhere on the vehicle. See sources and related links below for bulb information. See owner's manual for location and identification of fuses.
RIGHT HAND SIDE BEANEATH THE DASH THERE IS A BLACK COVER,TAKE THIS COVER OFF AND THE HARNESS PLUGS INTO THE RESISTOR.
Yes.