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

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