Troubleshooting Green Wire on Trailer Pulled by 2003 Ford Expedition

Question:

As Im checking the trailer connection the turn/stop lights dont work .. Ive already found that the green wire dont work .. Ive checked the fuses as well and all is good .. where could I find the wire diagram or where does the wire lead to I lose it under the frame

asked by: Daniel

Expert Reply:

On a 4-Way flat trailer wiring harness, the green wire will go to the right turn signal. The white is the ground, brown is running lights, and the yellow is left turn signal. Take a look at the trailer wiring diagram that I included. This very well could be a ground problem. If so, correcting the bad ground or broken wire could solve the problem.

expert reply by: Chris O