Question about 2004 Chevrolet Silverado 2500HD

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Where does the brake controll harness plug in under the dash

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If you have the plug for that model, it goes into a spot in the top of the fuse block. Hard to see from under the dash, but there are spots for additional plug ins. I believe you want the top right most plug.

Posted on Aug 09, 2009

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1 Answer

Wire trailer brake controler on ford pickup


There usually is an open harness plug under the dash. When you buy a brake controller, the instructions should come with it. The better units will have a pigtail which will plug right into the other half of the open harness plug.

If the kit you have has the pigtail connector, but loose wires needing to be connected, see if the color of the wires match those on the open connector. Then match the color of each wire.

Some years of trucks will have a heavy duty flasher to install in the Powerbox to accommodate the extra trailer lights.

Mar 02, 2015 | Ford Cars & Trucks

1 Answer

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.

Jul 03, 2011 | Ford F-150 Cars & Trucks

1 Answer

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


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

Oct 15, 2010 | 2005 GMC Yukon Xl Denali

2 Answers

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

1 Answer

Got a 250 supper duty looking for elertic brake controler harness.found a bundle of wires by emergency brake but no 4 prong gray plug.but a lot of wiers with no ends.


it under the dash to the right hand side. must remove lower dash panel to acess. and i think its a 6 pin harness your lookin for in the ford.

Feb 24, 2010 | 2007 Ford F-250 Super Duty Lariat

1 Answer

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

2 Answers

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

Oct 24, 2009 | Chevrolet Silverado 1500 Cars & Trucks

2 Answers

How do you install an electronic trailer brake controller in a 1995 GMC Suburban 1500?


a brake controller has 4 wires on it, Black, white, blue,red.

Black is positive battery 12 volts connect to 30 amp circuit breaker to the battery

White goes to good solid ground

red connects to white wire from the brake switch

blue wire connects to 7 way trailer connector at rear of truck. If the truck has trailer package you will find the blue wire and red wires under brake booster taped to the harness you can connect your blue brake control wire to that blue wire. At the rear of the truck the other end of the blue wire will be taped to a harness under the rear of the truck. you will have to now connect the blue wire to the blue input on your 7 way connector

Sep 16, 2009 | 1995 GMC Suburban

2 Answers

Under dash wiring harness for electric brake


you might ask dealer if there is a harness you need to buy that T-s into the factory under dash please rate -jeff

Aug 31, 2008 | 1998 Chevrolet C1500

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