How to Find Wire Functions for Trailer Wiring On a 2006 Ford Ranger

Published 09/03/2014

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16 Gauge, 4 Conductor Bonded Parallel Wire - Per Foot

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Hook Probe Circuit Tester

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Question:

Coming out of Ford Ranger 2006 to trailer -white -gray - green and yellow wires Trailer has five wires leading to truck. yellow green green/gray yellow/gray white How do they line up correctly?

asked by: Joseph

Expert Reply:

Since there is no standard for wire color and function, you would have to test the wires using a circuit tester such as # PTW2993 to determine their functions. One the trailer side it is likely that yellow is left turn/brake lights, green is right turn/brake lights, yellow/gray is running lights for the left side, and green/gray is running lights for the right side. White would be the ground.

But you will also want to test the trailer wires (if there is a connector on the trailer side already then testing is not necessary). You can either trace each wire back to see where they all terminate. Or you can use a separate 12-volt battery and apply power to each wire and see what turns on.

expert reply by: Michael H