Wiring Diagram For Trailer Lights 4 Pin. Yellow and green are for left and right turns and braking. Three wires are for the trailer while the last wire is the ground wire.
Below is the generic schematic of how the wiring goes. 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. Many trailers have three circuits.
4 pin connectors are the standard used for most trailers.
Many trailers have three circuits. For example in case a module is usually powered up and it sends out a signal of 50 percent the voltage and the technician does not know this he would think he has a. 4 pin trailer wiring diagram. Can also be used as custom wiring on trailers with 3 light wire systems.