Brake Controller Wire Functions for a 2003 Toyota Tundra

Updated 09/22/2014 | Published 09/21/2014

Products Featured in This Question

Curt Venturer NEXT Trailer Brake Controller - Up to 3 Axles - Time Delayed

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$81.76

Curt Custom Wiring Adapter for Trailer Brake Controllers - Dual Plug In

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$13.10

Question:

I have a 2003 Toyota tundra. I bought a brake controller. I am having a problem with the controller and need a wiring diagram for the controller/truck

asked by: Evens B

Expert Reply:

If your 2003 Toyota Tundra came with a factory installed 7-Way trailer connector and you are using Curt brake controller # C74VV then you will need the proper wiring harness to plug it into your truck, # C51362.

If your truck did not come with factory 7-Way and you are trying to hardwire in the controller then the black wire is 12 volt power to the controller, white is the ground wire, red is input from the cold side of the brake switch, and blue is output to the trailer brakes. I have linked a couple of videos to the right that should help.

expert reply by: Michael H