Question about 2006 GMC Sierra 2500HD 2WD

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2006 GMC Sierra 1500 - no power to the battery wire at the trailer hitch - is it uder stud #2 in the fuse panel? do I need to add a fuse?

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Yes you would need to put in a fuse. It is in the fuse box under the hood at the driver side. it may be labled as LT or RT TRLR ST TRN.

Posted on May 22, 2011


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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

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Where is the fuse for a trailer lights

it should be at the back where the hitch is where the wire plug is there may be a lose wire that is not conected when u plug it into the trailer.

Nov 15, 2010 | 1999 GMC Sierra

1 Answer

2006 GMC Sierra The trailer park lights won't come on

Suspect 7 pin connector problem , you should have power on the 8pm positioned and the centre pin position as you look into the socket (on vehicle. These pins are both male pins as you look at them . If ok check trailer wiring where it splits for either lamp assy ! Good luck

Mar 09, 2010 | 2006 GMC Sierra 2500HD 2WD

1 Answer

Were do you hook up the two wires under the hood for trailer brakes on a 2000 silverado

Sometime around 2000, GM started putting trailering pre-wire harnesses in the vehicle. Your truck may have this harness built in and would greatly simplify brake controller installation. Look under the glovebox and see if there is a wire harness tied off. There will be four wires in this harness, which should be run over to the steering column to use it. Most trailer brake controllers are compatible with this harness.
The four wires in the harness are: Red, 12vdc; black, ground; blue or purple, brake pedal; and brown or white, trailer brake wire to seven pin, four pin, or five pin connector at trailer hitch, if your truck came from the factory with a trailer hitch.
If you are adding the hitch and do not have the four wire harness, the under hood wires from your brake controller are Red, connect to one of the studs under the distribution box cover (the distribution box is on the driver's side against the firewall. Underneath the cover are two large threaded studs which are hot from the battery all the time); and the other wire from your brake controller would have to be run the length of the truck along the frame, tied off in several places, to the trailer hitch connector on the bumper. Follow the directions that came with trailer hitch wiring connector to connect this wire to the proper pin in the connector.
If this has helped you, great, and please remember to vote/comment.
Good luck!

Feb 21, 2010 | 2000 Chevrolet Silverado 1500

2 Answers

When you plug the trailer the lihgts dont come on but the brake&signal lights do work

There's a break in the connection on the running lights..either on the car side of the plug or the trailer side.. use a probe light on each terminal of the car side plug with the running lights turned on...if there's power, then the problem is on the trailer... check for a damaged wire near the tongue ...usually the culprit..
Good luck... email if you need more help..

May 09, 2009 | 2006 GMC Sierra Denali

3 Answers

2006 GMC Sierra 2500HD 4WD trailer light connection fuse blown?

It is in the fuse box under the hood on the drivers side

Jun 27, 2008 | 2006 GMC Sierra 2500HD 2WD

1 Answer

No power to trailer running lights


This is a known issue and to my knowledge there was even a recall order to correct this fault. It would seem the the wiring harness itself is the reason. You may want to reference these pages here and/or here.

Should you however prefer to perform a DIY, then you would need a DVM to check for voltages. This page shows the possible wiring scheme used by most manufacturers for trailer configuration.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Jun 10, 2008 | 2006 GMC Sierra

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