How To Wire 7-Way Trailer Connector On Trailer for Factory Plug

Question:

I have a 2021 silverado with factory plug. My car hauler has 6 wires only. Green,yellow,brown. Then white and black wire. I need a new plug on the trailer. What and how do i wire this to be correct. The trailer has 1 axle trailer brakes???

asked by: Nathan S

Expert Reply:

In order to wire up the trailer to hook up to a factory 7-way trailer connector you can simply install a new end, the 7-Way Molded Trailer Wire Connector part # H20042 is what I recommend. I can't tell you what wire colors to hook where as not all trailers are the same but likely the green is right stop/turn, yellow is left stop/turn, brown is running light, white is ground, blue is brake output, black is battery charge, and yellow is reverse. If you don't have all functions you could be missing a few wires which is why you need to test by applying power to each and seeing which circuit it activates. I have attached a chart below as well.

Connector - Function - Usual Trailer Color

White Wire - Ground - White Wire
Red Wire- Left Turn and Brake - Yellow Wire
Brown Wire - Right Turn and Brake - Green Wire
Green Wire - Tail Lights - Brown Wire
Blue Wire - Brake Power - Blue Wire
Black Wire - 12 Volt - Black Wire
Yellow Wire - Reverse - Yellow Wire