Question about 2007 GMC Sierra 1500

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Looking for plug under dash to hook aux trailer brake controler

Need to find out where the connection is under the dash for the aux trailer brake controler and mabe what color it is for a 2007 GMC Sierra PU

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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.

Posted on Jul 01, 2009

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I have a 2009 GMC Sierra with towing package and a 7 pin plug on the rear bumper. I hooked up a new trailer with electric brakes and the display on the dash shows "trailer connected" and shows increasing...


It's a very good possibility that it is the trailer. You say that it is new, is it a brand new trailer or just new to you? If it is brand new, and you bought it from a place that deals with trailers, then I would say take it back and have them look over everything. If that's not an option, then it's time to pull out the circuit tester and start checking wires. See if you are getting power to the Blue wire on the trailer, and if so is there power all the way to the brakes. You will need someone to push on the brake pedal while checking the wires. If the power is good all the way to the brakes, then you will need to pull the drums and inspect the brake shoes for wear, and condition of the the brake components. If this is a used trailer, then it would be a good idea to do this anyway so that you can also inspect and grease the bearings. If everything looks good, then the brakes might just need to be adjusted via the slot on the back side of the brake housing. If no power is seen in the blue wire, check the Red wire (12v Aux/charging), if it doesn't have power, then you more than likely have a Ground issue. This can easily be checked by hooking the trailer to the truck (hitch). Both use a chassis ground, and will use the hitch itself as the ground connection, though it is not a good idea to use it as the ground point.

Apr 27, 2014 | 2009 GMC Sierra 1500

Tip

Trailer Wiring


Hello all,

For those of you that need to wire up a trailer or have to occasionally borrow trailers and look at the wiring plugs with disdain (I mean face it they don't make sense, grd is white, +12vdc is black, etc), this is for you.

Plug Types/Application
7 Way - RV Trailers, Horse and Utility Trailers
6 Way - Horse, Stock and Utility
4 Way - Utility Trailers

Columns are: Color, Function, Mark on the plug.

Seven wire Trailer plugs:

Horse, stock or utility trailers:

White = Ground - 1
Blue = Electric Brakes - 2
Brown = Tail and clearance lights - 3
Black = Battery, aux power - 4
Yellow = Left turn/Brake - 5
Green = Right turn Brake - 6
Orange or Purple (not both) = Auxilliary or Reverse - 7

Recreational Vehicle:
White = Ground - 1
Blue = Electric Brakes - 2
Green = Tail and clearance lights - 3
Black = Battery, aux power - 4
Red = Left turn/Brake - 5
Brown = Right turn Brake - 6
Yellow = Auxilliary or Reverse - 7


Six wire trailer plugs:

Horse, stock or utility trailers:
White = Ground - GD
Yellow = Left turn/Brake -LT
Green = Right turn Brake -RT
Brown = Tail and clearance lights - TM
Red or Black (not both) = Battery, aux power - A
Blue = Electric Brakes - S

Recreational Vehicle: (color, use, plug mark)
White = Ground - GD
Brown = Right turn Brake - RT
Green = Tail and clearance lights -TM
Black = Battery, aux power - A
Red = Left turn/Brake - LT
Blue = Electric Brakes - S


Four wire plugs:
White = Ground
Yellow = Left turn/Brake
Green = Right turn Brake
Brown = Tail and clearance lights


Ground should be 10ga.
Others 14 ga

A test light and a 12VDC power source can be handy for trouble shooting.
Best regards
Mike

on Jan 09, 2010 | Cadillac Escalade Cars & Trucks

Tip

Trailer Wiring 101


Hello all,

For those of you that need to wire up a trailer or have to occasionally borrow trailers and look at the wiring plugs with disdain (I mean face it they don't make sense, grd is white, +12vdc is black, etc), this is for you.

Plug Types/Application
7 Way - RV Trailers, Horse and Utility Trailers
6 Way - Horse, Stock and Utility
4 Way - Utility Trailers

Columns are: Color, Function, Mark on the plug.

Seven wire Trailer plugs:

Horse, stock or utility trailers:

White = Ground - 1
Blue = Electric Brakes - 2
Brown = Tail and clearance lights - 3
Black = Battery, aux power - 4
Yellow = Left turn/Brake - 5
Green = Right turn Brake - 6
Orange or Purple (not both) = Auxilliary or Reverse - 7

Recreational Vehicle:
White = Ground - 1
Blue = Electric Brakes - 2
Green = Tail and clearance lights - 3
Black = Battery, aux power - 4
Red = Left turn/Brake - 5
Brown = Right turn Brake - 6
Yellow = Auxilliary or Reverse - 7


Six wire trailer plugs:

Horse, stock or utility trailers:
White = Ground - GD
Yellow = Left turn/Brake -LT
Green = Right turn Brake -RT
Brown = Tail and clearance lights - TM
Red or Black (not both) = Battery, aux power - A
Blue = Electric Brakes - S

Recreational Vehicle: (color, use, plug mark)
White = Ground - GD
Brown = Right turn Brake - RT
Green = Tail and clearance lights -TM
Black = Battery, aux power - A
Red = Left turn/Brake - LT
Blue = Electric Brakes - S


Four wire plugs:
White = Ground
Yellow = Left turn/Brake
Green = Right turn Brake
Brown = Tail and clearance lights


Ground should be 10ga.
Others 14 ga

A test light and a 12VDC power source can be handy for trouble shooting.
Best regards
Mike

on Jan 09, 2010 | Dodge Ram 1500 Cars & Trucks

2 Answers

What does tbc fault mean on a 2006 f350


TBC means Trailer Brake Controller fault.Check for moisture/water in the trailer plug connector at the back of your truck. Water/moisture will cause TBC error codes. Look for moisture at all connections to the plug and inside the plug.Trailer brake controller that is built into your dash. If you are hooked up to a trailer it could mean you are losing your connection or ground to the trailer. If you are not connected to a trailer it means there is a problem with your brake controller possibly a short in the wiring caising the fault code. ----- It means either A) you have a bad ground on your trailer. Or B) your cable on your trailer is too short and causing it to pull out of the plug or C) you have a short in the factory trailer harness wiring or the plug is gunked up. --------- get this possibilities checked.It will help.Thanks.Helpmech.

Dec 24, 2010 | 2006 Ford F 350 Super Duty

1 Answer

I am putting in a trailer brake controler. I found the wires to hook the plug to, but where do they come out at the front of the truck? Are they under the dash?


Look at the harness on the back side of the fuse box under the hood. Pull the fuse cover and the fuse box housing. You will probably have to remove the fender brace. They usually run the wires to connect to in the harness and bend them back into the wrap. Should be orange and blue. You will have to splice into them under the hood and run wires into the cab along with a GOOD ground and the drake switch and a hot fused wire. Look at the owners manual and see if fuse post 1 and fuse post 2 are connected. If not, one will feed to the brake controller and the other to 12 volt power to the trailer... Blue brake and orange to trailer power.
Also look at http://www.etrailer.com/faq-wiring.aspx. Full of useful info.

Sep 17, 2010 | 1996 GMC Sierra

1 Answer

I do not have power on the aux. terminal in the trailer plug on a 2008 dodge ram. Any ideas?


You have got 7 pin trailer connector that was included in the optional trailer tow package. This trailer tow package also includes an electric trailer brake wiring provision that terminates at a connector located on top of the large body harness connection under the instrument panel to the left of the break pedal, as well as an electric trailer brake pigtail harness and an instruction card that are stored in the glove box when the vehicle is shipped from the factory. You will need to add an electric brake controller of your choice that will plug-in to the harness and that will also give you power on your auxiliary circuit.

Oct 04, 2009 | 2008 Dodge Ram Pickup 2500

2 Answers

Electric trailer brake hookup


Truck Brake control

Red/Black stripe Black

Blue Blue

Lt. Blue/white stripe Red

White White

Orange Not used

Jun 28, 2009 | 2006 Toyota Tacoma

1 Answer

Trailer fuse blows when hooked up


Is your truck wired for a 7 pin flat plug? if so are you using an adapter? The adapters are made differently. One has the center pin as brakes and the other uses the center as Aux. power. Any chance of an animal getting to the wires? They are kown to chew on the wiring. Also try http://www.etrailer.com/faq-wiring.aspx. They have a great website with lots of info.

Jun 02, 2009 | 1999 Dodge Ram

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
Blue is the trailer brake feed
Green is brake signal
White is Ground for the brake control

May 31, 2009 | 2003 Ford Expedition

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