Use only the needed wires, and ignore the others. It gets complicated when you have trailers with more cables, and in this case, you need an adapter to make the connections. Trailer Connector Pinout Diagrams 4, 6, & 7 Pin Typical trailer wiring diagram and schematic. 6 wire trailer wiring diagram . Wiring diagram for 6 wire trailer plug new hopkins trailer wiring. This article will be discussing trailer wiring color diagram. The image above shows a single axle trailer, and the next image shows wiring for tandem axles. 6 way connectors include the basic connection of running lights, brake lights, turn signals and a ground wire. 7 2 6 5 4 3. These 2 wire diagrams fit the needs of most trailers. There is a suggested and common method for 6 function trailer wiring. 6 way plug wiring diagr am standard wiring* post purpose wire color tm park lights brown gd ground black (or white) s trailer brakes blue lt left turn/brake light yellow rt right turn/brake light green ...