Wiring Color Code for a 4 Pole Flat Vehicle Connector

Expert Reply:

On a 4-Way flat connector like the 4-Pole 60 Inch Long Vehicle End, # 18002, that you have referenced, white is the ground wire. The brown wire is for the taillights/running lights. Yellow is for left turn signal and brakes. Green is for right turn signal and brakes. I have included a link below to our wiring FAQ page that shows and explains the functions of various trailer connectors, both vehicle and trailer ends.

expert reply by: Patrick B