4 Pin Trailer Light Wiring Diagram. Note that this type of 4 pin connector is less common that 4 pin flat connector. Use on a small motorcycle trailer snowmobile trailer or utility trailer. 1 4 wire the first 4 pins white brown yellow green just like the 4 pin connector above.
A 4 way plug connects your trailer and tow vehicle and provides the required running lights turn signals ground and brake lights. This is part 3 wh. Three wires are for the trailer while the last wire is the ground wire. This is an older 1999 trailer.
We ll walk you through the wiring process it s easier than you think.
The replacement lights have two wires red and black. I currently only have the brown wire exposed. The red and blue wire can be used for brake control or auxiliary. As a rule you can find these connectors on the older trailers and older vehicles built in the u s. 4 pin connectors are the standard used for most trailers.