Brake Controller Quit Working On 2005 GMC Sierra 2500HD
Updated 07/30/2020 | Published 02/15/2011
Products Featured in This Question
Question:
my brake controller is not receiving power. it was and then was intermitant and now is doesnt light up att all. all my trailer lights work, but the brakes do not. like i said, the controller was working then stopped. all fuses are good under the hoodand the connection under the dash is good. i even replaced 7 way plug on trailer, nothing happened. the controller used to have a constant green on when the trailer is hooked up, but now has nothing. is there a different fuse or something else that is going on? thanks in advance. love the web site 2005 gmc 2500hd
asked by: Joe
Expert Reply:
I would check the power distribution box under the hood of your 2005 GMC Sierra 2500HD . The box is located under the hood and on the inside of the drivers side fender. Remove the cover, and locate the two auxiliary power posts on the inboard side of the box.
The post closest to the rear of the vehicle should have a red wire attached to it. Next to this post in the fuse box there should be a green 30 amp fuse installed. If the fuse is not installed or is blown, or this red wire is not attached, the brake controller will not get power.
There is another fuse you will want to check that is in the power distribution box. It is a fuse for the center high mount stop light (CHMSL). The diagram on the lid of the cover will show the fuse location. If it is blown it will not allow the brake controller to work.
Using a circuit tester like part # PTW2993, I would also recommend testing the wires under your dash that are connected to the brake controller. The black wire should have power all the time, the red wire only when the brake pedal is pressed, the blue wire should show power when the manual switch on the brake controller is turned on and when the brake pedal is pressed. I am including a video link of how to test the wiring on your brake controller.
Also, I am including a link to a FAQ page on GMC brake controllers that will show pictures and describe everything about installing a brake controller in your vehicle.
Product Page this Question was Asked From
ModuLite Installation Wiring Kit
- Accessories and Parts
- Trailer Wiring
- Wiring
- Power Wire Installation Kit
- Tekonsha
more information >
Featured Help Information
Miscellaneous Media
Continue Researching
- Search Results: 7 way mount
- Shop: Brake Controller
- Search Results: tekonsha p3
- Shop: Pollak 7-Pole, RV-Style Trailer Connector Socket w/ Wiring Harness and Mounting Bracket
- Shop: Trailer Hitch
- Shop: Trailer Wiring
- Shop: Curt Trailer Hitch Receiver Lock - 2" and 2-1/2" Hitches - Stainless Steel
- Shop: Curt Trailer Hitch Receiver - Custom Fit - Class V Commercial Duty - 2-1/2"
- Shop: Curt Heavy Duty Forged Ball Mount for 2-1/2" Hitch - 2-5/16" Ball - 4" Drop - 20K
- Shop: Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 7-Way and 4-Pole Flat Connectors
- Shop: Curt Heavy Duty Forged Ball Mount for 2-1/2" Hitch - 2-5/16" Ball - 6" Drop - 20K
- Shop: Hitch Pin and Clip For 2-1/2" and 3" Hitches - 5/8" Diameter x 4" Span
- Q&A: Where is Fuse Under Hood of 2005 GMC Sierra that Powers Brake Controller
- Search Results: trailer hitch
- Q&A: What is the Difference Between a Class II and a Class III Hitch?
- Video: How to Choose a Trailer Brake Controller
- Article: Trailer Wiring Diagrams
- Q&A: What is the Difference Between a 4-Way and 7-Way Trailer Connector
- Video: What to Know About the Curt TriFlex NEXT Trailer Brake Controller
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Search Results: trailer wiring
- Search Results: trailer tires and wheels
- Shop: Suspension Enhancement
- Q&A: Lug Nut Torque Chart for Trailer Wheels
- Article: How to Measure for Trailer Hitch Drop
- Q&A: Installation Time for Blue Ox BX1128 Flat Tow Base Plate Kit for 2016 Jeep Grand Cherokee
- Video: Clean Up Your Trailer Wiring
- Search Results: trailer brake controller
- Article: Brake Controller Installation: Starting from Scratch
- Article: How to Choose the Right Trailer Hitch Class
on Accessories and Parts
Steve S.
7/26/2020
I checked the wiring under the dash going to my trailer brake controller. And they al show a signal as they should, but the blue wire was a week signal.Any ideas about why that would be?