7 Wire Trailer Plug June 13, 2019 PJ Trailers Trailer Plug Wiring. Trailer plug connector diagrams for electrical towing connectors. View diagrams for our 4-way, 6-way & 7-way plugs. www.pjtrailers.com 12 Gauge Romex10 Gauge 4 WireFlush Mount Electrical PlugBasic Boat WiringCopper Wire In HouseWiring Diagram Of Refrigeration SystemThermo Fan Wiring DiagramCeiling Pull Switch Wiring Diagram