Standard Flat 7 Pin Trailer Wiring Diagram. The wife and kids stare daggers into your head as you curse your way through hours of The standard trailer plug and socket design is a color coded system using four wires. "Trailer Wiring for the Do-It-Yourselfer." trailerwiring.com. There are several standards for trailer wires, and if you search, you'll find a different Trailer Wiring Diagram for each.
Use this as a guide to which wire colour. There are several standards for trailer wires, and if you search, you'll find a different Trailer Wiring Diagram for each. Not surprisingly, the standard flat-style connector for trailers uses four pins, with one unshrouded male pin on the vehicle end for the ground.
A wiring diagram is a simplified standard pictorial depiction of an electric circuit.
Not sure which wires attach to what on your trailer connectors?
Look at the wiring diagram for your truck and determine the designation given to the ground location for the taillights. Trailer Wiring Diagrams showing you the typical wiring for most single axle trailer and tandem axle trailers. The thing is I have to go to the tail lights to make attachments.