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Standard Color Code for Wiring Simple 4 Wire Trailer Lighting


I have had to mess with trailer wiring for years, once or twice a year anyway, and I just cannot keep the color code right, ect white/ground, brn/ running lights, grn/ right turn, yellow left turn? Please help me get it right. thanks

asked by: Gary R

Expert Reply:

You have it right so far, the 4-way connector is just as you have stated. Remember that Yellow has a L in it so that is the left side brake/turn signal and green has a R in it so that is the right side brake/turn signal.

The colors for wiring a 7-way connector are as follows with the 4 colors of the 4-way connector remaining the same.

Brown-Tail/Running Lights
Green-Right Turn/Brake - Remember green has an R in it
Yellow-Left Turn/Brake - Remember yellow has an L in it

Blue-Brake Controller Output
Purple-Auxiliary 12v Power/Reverse Lights/Reverse Lockout For Trailer Brakes
Black 12v Battery Power

I have posted a link to our FAQ wiring page for more detailed clarification.

expert reply by: Bob G

Robert G

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