Trailer Brake Wiring Connections Under Hood of 2003 Silverado 1500

Updated 05/03/2019 | Published 05/02/2019

Products Featured in This Question

Tekonsha Plug-In Wiring Adapter for Electric Brake Controllers - GM

(1197)

$21.40

Pollak 7-Pole, RV-Style Trailer Connector Socket w/ Wiring Harness and Mounting Bracket

(100)

$44.62

Question:

I have a 2003 1500 Silverado I watched your video and pulled open the fuse box under the hood they said there is two red wires and two blue wires that are not hookup I only found one red and one blue cant find the other two

asked by: Greg

Expert Reply:

You can refer to the linked help article for details on the wiring under the hood of your 2003 Silverado that you need to connect for trailer brake controller installation. There are both red and blue wires, as you noted. These are normally located next to the fuse block on the cab side as shown in the photo taken from the article. There is one wire of each color.

If you have a factory 7-way you will need a wiring adapter to plug the controller in to the port under the dash. For instance if you have a Tekonsha controller like the Prodigy P2 # 90885 you will use harness # 3015-P to connect it.
If you don't have a factory 7-way you also need either # PK11898 or # 30955 depending on whether there is a round plug or just cut wires above the spare tire.

expert reply by: Adam R