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The 1996 GMC Yukon brake lights work by receiving power from the brake light relay switch. The brake light relay switch is connected to the brake pedal.
You can also try ebay. I just purchased the 3rd brake light for my 2004 Yukon and saved $50 over the dealer for a new 3rd brake light. You can try at an auto salvage yard.
01 Yukon 3rd brake light removal......changing the third brake light on a 2001 Yukon is a relatively easy task. First open the rear liftgate (not just the glass). This will expose the two screws that secure the housing of the lamp to the body (it also exposes the connector plug which, obviously, you should unplug). After removing the two screws, separate the rubber housing from the LED lamp itself....and there you have it!...because the third brake light is a sealed lamp the entire brake light must be changed. you can�t just replace the bulbs. ...
Defective or misadjusted stop light switch?
1994 gmc no brake lights 3 brake light works need help
On top of the pedal behind the steel housing. Its tough to see
how to get rear brake pads off 2003 Yukon denail
Go to the brake pedal and it is mounted under there then unplug the connector and screw out the part then screw the new one in and replug the connector in.
The Trail of the Upper Yukon - 1915 was released on: USA: 27 May 1915
There is a Fuse Under the Hood called CHMSL. This stands for Center High Mount Stop Light. It should be a 10a Fuse.
The cast of The Trail of the Upper Yukon - 1915 includes: Dorothy Phillips as Marcia Arthur Ritchie
Open the rear hatch. There are 2 screw in the sidewall next to the brake lights (Right or Left). Remove those 2 screws and the brake/signal light housing will come out along with the wire harness for the lights. There should be 3 separate pairs of wires going to the Turn Signal, Rear Lights and Brake lights. Follow the wires to the brake lights and untwist the bulb housing and pull it out. Remove the bulb by pulling it from the socket. If you already have the replacement, plug it in and reassembl everything. If you do not have the replacement, take the bulb to the parts store and ask for the replacement brake lights for a 2005 GMC Yukon and give them your old one. They'll look at the numbers on the bulb and sell you the new ones.