4-Way Trailer Wiring Recommendation for 1991 Ford F-150

Updated 01/31/2018 | Published 01/30/2018

Products Featured in This Question

Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

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$32.44

Hook Probe Circuit Tester

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$14.36

Question:

I am trying to wire a four flat on a 91ford f150 and I dont know where the wires are that I can connect to for it to work

asked by: Earlbeard

Expert Reply:

The easy way to install a 4-way trailer wiring harness on your 1991 Ford F-150 is with the part # C55316 which will plug in line with your taillight wiring harness.

Otherwise you'd have to use a circuit tester like part # PTW2993 to test the wires of your taillight harness and wire them accordingly to the 4-way. The 4-way wiring colors are:

White is ground, yellow is left turn/stop, green is right turn/stop, and brown is running light.

expert reply by: Jameson C