Completing Under Hood Wiring Connections When Installing Brake Controller on 2002 GMC Sierra 1500
Question:
If this plugs into the factory port under the dash on my 2002 Gmc sierra 1500, what are the red and blue wires under the hood for? What are they supposed to be connected to? The truck has the light duty trailer wiring only, 4 pin flat connector so i know i have to run wires back to the rv plug for brakes and power. However i still dont know where to connect the underhood wires.
asked by: Brian R
Expert Reply:
To install the controller itself, you will first need the # 3025-P wiring harness.
Under the hood, The red wire that provides power for the brake controller needs to be connected to the power post on the fuse box that is closest to the firewall. A 30 amp fuse will need to be placed in the closest fuse location to the post to activate it. The blue wire which carries the brake controller output voltage will need to be extended with a length of 10 gauge wire and extended under the vehicle to the 7-way connector at the rear of the truck. If you need a 12-volt accessory circuit for the 7-way, a 40 amp fuse should be placed in the location closest to the other post. Attach a ring terminal to another length of 10 gauge wire, and run it to the trailer connector.
If you are running two circuits to the trailer connector, one for brake controller output and the other for the 12-volt accessory power circuit, you can use a length of duplex cable, part # 10-2-1 which is sold by the foot.
We have an FAQ article that describes the process for you, to see the article click the provided link. I have also linked you to a video that will walk you through the procedure, start to finish.
Product Page this Question was Asked From
Tekonsha Prodigy P3 Trailer Brake Controller - 1 to 4 Axles - Proportional
- Trailer Brake Controller
- Proportional Controller
- Electric
- Electric over Hydraulic
- Automatic Leveling
- Under-Dash Box
- Dash Mount
- Up to 4 Axles
- LCD Display
- Up to 360 Degrees
- Tekonsha
more information >
Featured Help Information
Instructions
Miscellaneous Media
Continue Researching
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Article: Brake Controller Installation: Starting from Scratch
- Article: Trailer Wiring Diagrams
- Article: Towing a Trailer? Let's Talk About Brake Controllers
- Article: Installing an Electric Brake Controller on 2007-2013 GM Full-Size Truck or 2007-Present GM SUV
- Article: How to Install a Brake Controller on Chevrolet / GMC 1999-2006 Pickups
- Article: How to Measure for Trailer Hitch Drop
- Q&A: What is the Difference Between a 4-Way and 7-Way Trailer Connector
- Q&A: Does the Tekonsha P3 Trailer Brake Controller Turn Off or Stay On All the Time
- Q&A: Parts Needed To Install A Brake Controller On A 2023 Freightliner Cascadia
- Q&A: Suspension Enhancement Recommendation for 2019 Toyota RAV4
- Q&A: How Does Brake Controller Install on Freightliner S2RV Chassis
- Q&A: Parts Needed to Add 7-Way & Brake Controller on 2023 Kia Sportage
- Q&A: Brake Controller Recommendation for a Truck with Air Brakes and a Trailer with Electric Brakes