Dodge 7 Pin Trailer Wiring Diagram With Brakes. The trailer brakes are activated. actuating pin before towing the trailer. Regardless of wire color, the pin position for function is pretty standard.
If you have a permanent light mode in your hitch light. There is a lot wiring that you have to tie into your Refer to the wiring diagram for your truck and determine which wire in the harness for the left taillight assembly controls the left-turn signal and brake. Trailer Wiring and Brake Control Wiring.
I drew this crude diagram to help explain.
Trailer Wiring and Brake Control Wiring.
Trailer Wiring Diagrams showing you the typical wiring for most single axle trailer and tandem axle trailers. You should be able to easily find a Curt harness that plugs into that pig tail and give you the required wiring plug for your trailer. Trailer wiring is very important to towing safety.