Wiring Diagram For Trailer Hitch Plug. Trailer electrical connectors come in a variety of shapes and sizes. If you have a good repair manual, and you should, you can use the wiring diagrams inside to find Testing the new trailer wiring at the plug.
Trailer Wiring Diagrams showing you the typical wiring for most single axle trailer and tandem axle trailers. Restore the brake lights and turn signal on your trailer to proper operation with Dorman's Trailer Hitch Plug. The Plug is constructed from durable materials to protect the wiring.
It is easier than you think.
Please correct me if I am wrong.
I intend to install a tow hitch and wiring harness myself. I hooked up to my trailer for the first time yesterday and no electric brakes. I traced the wiring back to the engine compartment and found a blue wire.