4 Plug Trailer Wiring Diagram. Attach white ground wire to trailer frame. Install the greenbrown wires along the right side of frame.
The other thing which you will see a circuit diagram would be lines. A 4 wire system will not use the 5th blue or red wire. Traditional trailer with brakes use a 5 pin connector.
Corotc 7 to 6 way trailer adapter 7 pin flat to 6 pin.
Click on the image below to enlarge it. Blue electric brakes or hydraulic reverse disable see blue wire notes below in the trailer wiring diagram and connector application chart below use the first 5 pins and ignore the rest. There is a very basic 4 plug trailer wiring diagram. The pictures below show the 3 most common plugs for motorcycle trailers.