4 Wire Trailer Light Diagram

A custom wiring harness or t connector is a vehicle specific harness that plugs in without any spicing required and provides a standard connector output such as a 4 way flat.

4 wire trailer light diagram. The red and blue wire can be used for brake control or auxiliary. Most of us aren t electricians but that doesn t mean wiring a trailer or replacing corroded wiring is beyond us. It is referred to as such as the system needs a mere four wires for the trailer tail lights turn signals and brake lights to illuminate. Wiring instructions for optronics 4 1 2 inch round trailer stop turn and tail light st40rb installing a brake controller on a 2002 dodge ram 1500 equipped with a factory 4 way can trailer 4 way be ran to trailer with 8 wires for trailer wiring.

The basic purpose remains the same whether your truck and trailer is using a 4 way 5 way 6 way or 7 way connector. Custom wiring is the ideal solution for installing trailer light wiring on your vehicle. Can also be used as custom wiring on trailers with 3 light wire systems. While the basic configuration is a 4 way flat connector that features one female and three male ends you may come across connectors with up to seven pins for additional functions that require wiring including electrically actuated brakes power source for a winch etc.

By law trailer lighting must be connected into the tow vehicle s wiring system to provide trailer running lights turn signals and brake lights. Use on a small motorcycle trailer snowmobile trailer or utility trailer. Though trailer lighting systems are available in an array of configurations the most popular is the 4 way system. Trailer electrical connectors come in a variety of shapes and sizes.

Start by cutting the white wire and attaching it to the trailer frame. You must check the trailer manual to see if the wiring is correct but normally the white wire is called the ground wire while the brown wire is used for tail lights. A 4 way plug connects your trailer and tow vehicle and provides the required running lights turn signals ground and brake lights. 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.

We ll walk you through the wiring process it s easier than you think. Installing the 4 pin trailer wires. 1 4 wire the first 4 pins white brown yellow green just like the 4 pin connector above. The 4 way system is designed so the right brake light wire and right turn signal are green.