There are two types of 7-way connectors. One has flat pin and the other has round pins. The following schematic shows a Typical 7-Way Trailer . It should be noted that the center terminal is labeled as an auxiliary circuit but is most commonly used for backup lights not as a ground terminal as many try to use it.

7-Way Trailer

7-way trailer wiring diagram

7-Way Trailer Color Code

Color
white
blue
green
black
red
brown
yellow

Circuit Function
common ground
electric brake
tail/running lights
battery charge
left turn/stop
right turn/stop
auxiliary/back up



Related Post

Daihatsu F70 F75 F77 Fourtrak Harness Wiring Diagram
Wiring Harness Diagram and Electrical Troubleshooting for 2001 Infiniti I30 A33 Series
2007 Toyota FJ Cruiser Trailer Wire Harness and Diagram
2008 Cadillac Escalade Instrument Panel Fuse Box Layout
Nissan LEAF Body Electrical System and Wiring Diagram