Question about 2005 GMC Yukon Xl Denali

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I have a 05 Denali XL 6.0 and i can't find the trailer brake harness under the dash. Please help!!

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Hi, the provision for the electric brake controller is located in the electrical center , just to the right of the parking brake. There is a plastic nut, that holds the cover on, and beneath this cover are ports where a connector may be plugged in. A factory harness must be obtained from a Chevy, or GMC dealer for the install. This harness will be labled with wire locations, as it will be attached to your brake controller, then plugged into the slot in the upper l/h corner of the electrical center. The plug will only fit in the appropriate slot. You will then need to put the provided J- fuse into the underhood fuse block. Tis should be the only missing fuse. You should be well on your way, after these few easy steps. Good luck...Coop

Posted on Oct 15, 2010

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Related Questions:

1 Answer

2007 Yukon Xl Denali can the headlight switch/dimmer cause only the tail lights to not work. Dash lights, signals, brake lights when pressed work. Both sides went out. No blown fuse or broken wires.


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

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I am installing an electric trailer brake controller on my 2008 Ford F- 150 STX pick up truck and I need to know where it plugs in under the dash


Ford's factory supplied brake controller harness end can be found loosely stuffed under the dash, usually just above the driver's right leg. A Ford harness has a rectangular shaped connector.
Simply connect the brake controller harness connector into the vehicle connector. Zip tie the harness wires to another harness to prevent the wiring from hanging down near your feet.
I hope this helps.

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Is there a wiring harness for the trailer brake control to be wired into from the factory If so what are the color codes and where do I find these wires If not do i have to wire these to the plug myself....


most new trailer brake units dont splice into the lines anymore they have vehicle specific plug that connects in line with brake harness under dash or under hood

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1 Answer

Where is the fuse box on a 2004 yukon xl denali


It is either under the driver side dash area between the brake pedal the door. Or under the hood near the left or right fender

Aug 03, 2009 | 2005 GMC Yukon Xl Denali

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you need to check to see if it is connected inside the truck there is a plug below the dash near the parking brake

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1 Answer

Trying to connect a teekonsha voyager brake control to a 2003 expedition


Their should be a 6 pin conector that only 4 pins are used somtimes a 5th wire is installed for illumination, don't worrie about using that one. The connector is located in one or two different spots, the most popular place is under the dash on the drivers side just below the steering column the connector is grey. The colors are black or red / blue / green / white and sometimes a small black or brown wire is for illumination, don't worrie about that wire. Their are wiring harnasses for sell to hook the brake control through the conector, but if you do not want to buy an adapter hook the wires as followed: Vehicle Brake Control
Black or Red Black
Blue Blue
Green Red
White White
Black is power in to the brake control
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Rear led brake light broke, replaced but new not working


YOU MIGHT WANT TO TRY TESTING THE TRAILER PLUG FUSE SOME OF THE THIRD BRAKE LIGHTS WORK OFF THAT FUNCTION. IF THAT DOES WORK TEST THE PLUG FOR POWER BEFORE THE PLUG, IF YOU HAVE POWER THAN IT IS IN THE PLUG, IF YOU DONT THAN CHANCES ARE IT IS IN THE FUSE BOX TEST ALL FUSES UNDER DASH AND UNDER THE HOOD.

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