7 Blade Trailer Plug Wiring Diagram Ford. This is going to make this. See the extra wire (above) that's been capped off from the factory?
Complete with a color coded trailer wiring diagram for each plug type, this guide walks through various trailer wiring installation solution, including custom wiring, splice-in wiring and replacement wiring.
Trailer Wiring Diagrams showing you the typical wiring for most single axle trailer and tandem axle trailers.
Look at the wiring diagram for your truck's ignition switch. Not sure which wires attach to what on your trailer connectors? Wiring an aftermarket plug as opposed to an original equipment manufacturer plug may void the existing warranty on your truck's electrical system.