Question about Chevrolet Silverado 1500HD

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I installed a trailer brake controler on my 2003 silverado 1500hd with the kit that plugs into the factory wiring harness and the trailer brakes worked fine but the brake lights and the cruise control do not work any more. I replaced the brake light switch and I am still having the problem. I also checked all the fueses and they seem to be all fine. I have the controller unplugged now and the same thing is still happening. Any ideas please let me know.

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Check 25A fuse under the hood.
Check 15A stop light and 10A turn signal fuse under the dash.
If all fuses check out, verify that the switch is operating the brake lights.

Posted on Sep 11, 2010

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Posted on Jan 02, 2017

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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

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I have a 2001 F150 and am trying to find out where the factory installed plug in is for the brake controller wiring. I have the brake controller and the instructions say to read the truck owners manual...


Hi. There is a grey plug with 6 wires right behind your OBDII diagnostic port on the lower dash board above your accelerator pedal.

The color of the wires on the plug are blue, green, red, white and brown. The wires are as follows:
Blue....electric trailer brake feed
Green....brake pedal switch
Red...12v postitive...always hot
White....ground
Brown....interior vehicle illumination (not used)

The factory wire harness that you will need to attach your brake controller will plug right into this plug. The factory wires are colored the same as above.

After-market and brake conroller wires are colored as follows:
Blue....electric trailer brake feed
Red.....brake pedal switch
White....ground
Black....12v positive

Sep 01, 2010 | 2001 Ford F150 Styleside SuperCrew

1 Answer

2009 Silverado 4x4 pickup with towing package and factory installed Trailer Brake controler installed at factory. The system has worked in past. I had my Stock trailer rewired and things tested out fine...


It sounds like you lost a ground.
check traier hookup first.
Probably not the controller.
P.S. There are multiple fuses for this setup. check all ! ! !

Aug 19, 2010 | 1999 Chevrolet Silverado 1500

2 Answers

No left turn or brake light on left for trailer truck works fine. No current in trailer plug wire


There are separate fuses for the trailer turn signals.Make sure they are good.They are in the under hood fuse block.If they are then check for corrosion in the trailer harness wiring.Hope this helps.Good luck.

Mar 10, 2010 | 2003 Chevrolet Silverado 2500HD

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

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

Trying to install wiring kit for trailer on a 2003 chevy malibu


On the trailer plug
Yellow= Right turn/brake
Green= Left turn/brake
Brown is marker lights
white is the ground.
You might want to check with a parts store to see if a "hoppy" plug is available, it plugs into the factory harness and make it much easier and neater. Lee

Oct 04, 2009 | 2003 Chevrolet Malibu

2 Answers

Where does electric trailer brake harness plug into under dash


what are you asking? how do you get the lights to hook up to the back of your truck? you may need a pigtail connector to hook the trailer up and have it work properly.

Jul 30, 2009 | 2004 Chevrolet Silverado 2500HD

1 Answer

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

2003 duramax 2500hd brake lights stay on when lights are on


You may have faulty wiring for your trailer lights. Look under the back of the truck where the wiring harness leads to the trailer wiring harness. Usualy it is a 3 way plug in the harness. Try unpluging the harness from the trailer wiring and just plug the other 2 wires into eachother
Hope this works for you!

Dec 17, 2008 | 2003 Chevrolet Silverado 2500HD

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