Hi there, first I'm canadian and my SUV so. I'm a hobbyist doing his best, not a mechanic, I don't take charge of other people's installation issues. Anyway, I decided to buy a SUV some months ago, and it comes without the wiring harness for the trailer and the hitch. I made it myself. In this part, only the wiring will be presented. This is for 4 pins harness connector. In any doubt, you can do as I have done for some wires; use a multimeter. Everything on that car works on a 12VDC. Ground...