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 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 Diagram

7-way trailer wiring diagram

7-Way 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

Keywords:

Related posts:

BMW 3 and 5 Series Body Electrical Wiring Diagram
Wiring Diagram Software using Diagram Studio
Mazda Miata Wiring Diagram and Electrical Schematics (99)
1997 Chevrolet Blazer Anti Lock Brake Circuit
Toyota Tacoma Truck Starting System Wiring Diagram