There are two types of 7-way trailer wiring connectors. One has flat pin and the other has round pins. The following schematic shows a Typical 7-Way Trailer Wiring Diagram. 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 Wiring Diagram

7-way trailer wiring diagram

7-Way Trailer Wiring Diagram 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

1997 Chevrolet Blazer Anti Lock Brake Circuit
Best Car Amplifier Wiring Diagram Site
1997 Infiniti QX4 Wiring Diagram and Electrical System Service and Troubleshooting
Honda VT750C ACE Wiring and Electrical System Circuit
2002 Mazda 323 / Familia / Protege Anti-Lock Braking System