Question about 2007 GMC Sierra 1500

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Where do you plug in the trailer brake controler harness

Where do you plug in the brake controler harness for my 2007 GMC Sierra I have a after market wire harness that I purchased with the controler for my truck

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Brake controller should plug into the rear lights.

Posted on Apr 22, 2009

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1 Answer

Where is the plug for a trailer brake controller hookup on a 05 gmc 5500


There is none from the factory. You have to splice the wires from the controller into the vehicle harness and run a wire to the trailer brake pin in the socket where the trailer cord plugs into the truck

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2008 GMC C5500 factory wired for trailer harness (7 pin). I just purchased brake controller and am trying to find where the controller harness plugs into the truck harness. Looking under the dash. Plug...


You are probably going to find four wires together that do not have a plug on them. There should also be a tag taped on the wires showing that it is for the trailer. You will have to put a plug or some kind of connection on those wires.

Mar 13, 2010 | 2008 GMC Sierra 3500HD 2WD

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I'm trying to install a Tekonsha trailer brakes and need the wiring diagram


The controller should have wiring diagrams with it. Also try http://www.etrailer.com/faq-wiring.aspx. The truck should have a harness that plugs into the factory harness under the dash. The harness paperwork will describe where it plugs into and what wires go where along with fuse location. If you don't hav the harness, you can get it from the dealer or the site listed above.

Feb 03, 2010 | 2003 GMC Sierra 2500HD

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Need to upgrande trailer brakes


power wire should connect through a 30 amp resetting circuit breaker directly to the hot terminal of the battery. Brake line should be the same.

Jan 15, 2010 | 1999 GMC Sierra

1 Answer

Need help installing electric trailer brake controller


easiest way is to also buy the wiring adapter almost all elect brake units sell a vehicle specific wire harness that u unplug brake wire harness plug in other harness than plug in brake harness and just connect the wires to elect brake controller eliminates cutting and splicing ur brake harness about $18

Oct 25, 2009 | 1999 GMC Savana

1 Answer

Trailer brakes lights dont work on my 2001 gmc 2500hd


Do you have brake lights on truck? Is this a new hook-up or has it been hooked up before & worked fine? If your brake lights on truck are one color (red) and your turn signals are another (amber) you will need to buy & connect a small converter that goes in harness to plug in order to separate the 2. Instructions with converter are pretty simple.

Jul 20, 2009 | 2000 GMC Sierra

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Trailer brake controller problem


I found the problem. Talking with a technician from the controller company, we determined that it was a fuse problem. I found that the fuse to the CHMSL was blown.


Jun 30, 2009 | 2003 GMC Sierra 1500

1 Answer

Looking for plug under dash to hook aux trailer brake controler


The connector is located under the dash on the left side of the steering column. Their is a box, remove the cover and starting from the top left the second connector location moving to the right is the one to hook into, make sure that you have the correct wiring harnass adapter for the vehicle, their are two different ones for GM trucks. On the inside of the cover is also a diagram of the lay out of the box.

Apr 22, 2009 | 2007 GMC Sierra 1500

2 Answers

Tail light problems on 1996 GMC Sierra pickup


I had similar problem with my 97 sierra... I only lost 1 light, then brake lights stayed on all the time... turns out the "t" connector for the trailer harness under rear bumper was rotted inside...unplugged the 2 parts of the harness and pluged them into each other with out the "T" harness.... everything works great... Hope it helps ya

Jan 01, 2009 | 1996 GMC Sierra

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