How Does a Trailer Side and Vehicle Side 7-Way Get Wired

Updated 10/14/2013 | Published 10/10/2013

Question:

My wires from my tralor are Blue Green Black Red Brown Yellow Only 6 every diagram has a white wire and I dont I cant get my lights right can u help

asked by: Bobby W

Expert Reply:

You cannot go by wire color in most cases because there is no real standard. We have blue for trailer brakes, yellow for left turn/brake lights, brown for running lights, green for right turn/brakes, black for 12 volt power, white for ground, and purple for reverse or AUX power at the center.

Since your lights are not working something must not be in the right spot. What you can do is touch each wire to the positive terminal of a separate 12 volt battery and see what lights up. Or you can follow each wire back to see where it ends and determine function that way. Then you can wire the trailer side connector accordingly. Follow the diagrams I have included. They are labeled vehicle side and trailer side so you will not confuse the 2.

expert reply by: Michael H