Installing a Brake Controller with 4 Wires in a 2007 Ford F-150

Updated 02/17/2017 | Published 02/16/2017

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Tekonsha Prodigy P2 Trailer Brake Controller - 1 to 4 Axles - Proportional

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Hook Probe Circuit Tester

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Question:

2007 Ford F150 factory wiring harness has 5 wires, the extra is green labelled stop lamp. My Reese Brakeman IV #8507111 only has wires, black, blue, white and red. How do I wire this? Thanks

asked by: Russ

Expert Reply:

Because your 2007 Ford F-150 has an extra wire, you will need to determine their function and match that with the 4 brake controller wires. You will need a circuit tester like # PTW2993 to probe the wires for function.

The four wires from your brake controller are:
Blue=brake controller output
Black= Battery In (+)
White= Ground (-)
Red=Stoplight

I've attached a photo and an article to help. The 5th wire is to add the center brake light to a truck bed cab.

expert reply by: Jason S