Trailer Plug Wiring Diagram Harness For A. On the 5 pin trailer wiring diagram there are five wires. Wiring trailer lights with a 4 way plug its easier than complete with a color coded trailer wiring diagram for each plug type including a 7 pin trailer wiring diagram this guide walks through various trailer wiring installation solution including custom wiring splice in wiring and replacement wiring.
You can also watch a video where glenn explains how to wire a 7 pin plug here. Below is the generic schematic of how the wiring goes. Right turn of vehicles wiring harness trailers right turn signal left turn yellow 18 16 left turn of vehicles wiring harness trailers left turn signal ground white 16 12 vehicle ground point metal uncoated rustproof vehicle ground point metal uncoated rustproof tail marker brown 18 16 taillight of vehicles wiring harness trailers taillights brake blue 18 12.
The first diagram is a simple set up of two brake lights two indicators and two side lights.
Note that this type of 4 pin connector is less common that 4 pin flat connector. The images below show the common wiring guide for trailer plugs adapters sockets. The photos are what the adapters look like when removed from their housings. Click on the image below to enlarge it.