4 Pin To 7 Pin Trailer Wiring Diagram. Cut the four-pin plug off of the trailer harness. Trailer wiring is very important to towing safety.
There should be a common color for both the tail lights. The length of copper to expose may differ depending upon your replacement plug. Trailer Wiring Diagrams showing you the typical wiring for most single axle trailer and tandem axle trailers.
Chances are it will be as easy as locating something with a label that reads "Seven-pin to four-pin trailer wiring adapter." "Trailer Wiring for the Do-It-Yourselfer." trailerwiring.com.
Cut the four-pin plug off of the trailer harness.
Use your wire strippers to remove the shielding from each wire. Please see the Trailer Wiring Diagram and Connector Application Chart below. The first step in wiring your trailer cables is to ground the white cable first.