Learn how to hook up your 7-way trailer and RV plug. View our diagram at AJ's Truck and Trailer Center, Inc*, read a step-by-step guide, and watch a how-to video. Need to buy a trailer? We've got your covered at AJ's Truck and Trailer Center, Inc*.. A 7 pin trailer wiring diagram is a schematic that shows the pinout and function of each wire in a 7-way round trailer connector. The standard 7-pin connector contains the following wires and functions:
Clear 7 wire trailer plug wiring diagram with pin functions and color codes. Learn how each connection works for safe and accurate trailer wiring.. 7 Pin Trailer Wiring - Color Codes There are seven different electrical wires that connect and sync the 7 pin trailer connector with your vehicle. That said, the wiring harness in the majority of vehicles will contain eight different wires, and sometimes even more.