7 Pin Connector Wiring Diagram Heavy Truck. The 7 pin flat plug will fit into a 12 pin. Blue pin for electric brakes.
Click on the image below to enlarge it. The 7 pin flat plug will fit into a 12 pin. Use the 7 pin connector anyway see below and just leave out the last 2 wires.
Wiring diagram for semi plug google search trailer.
Nilight heavy duty 7 way inline trailer. This article will be talking 7 pin trailer wiring diagram truck side. I have also included a picture that shows the typical wiring diagram of a 7 way round pin trailer side connector. The 7 pin flat plug will fit into a 12 pin flat socket and work perfectly.