7-Way RV Trailer Connector Wiring Diagram | etrailer When wiring a trailer connector, it is best to wire by function, as wire colors can vary. We have an excellent wiring diagram on our website, I will provide you a link so you can look at it. If you are looking at the inside of the trailer connector where the wires mount to the terminals starting at the notch at the top and working clockwise:5/5(17)Brand: Draw-Tite How To Connect 7 Way Trailer & RV Plug - Diagram & Video 7-Way Trailer & RV Plug Diagram. This guide is here to help you. If you can not figure out your wiring even after reading this guide, then contact your LOCAL mechanic or trailer shop for help. If you are local to us, give us a call if you want to schedule a time to have your trailer fixed.