Simple 4 Wire Trailer Light Wiring

Installing the 4 pin trailer wires.

Simple 4 wire trailer light wiring. Start by cutting the white wire and attaching it to the trailer frame. I have had to mess with trailer wiring for years once or twice a year anyway and i just cannot keep the color code right ect white ground brn running lights grn right turn yellow left turn. By law trailer lighting must be connected into the tow vehicle s wiring system to provide trailer running lights turn signals and brake lights. Step by step now that we have an idea what our wires do let s get into the step by step process of wiring your trailer.

Standard color code for wiring simple 4 wire trailer lighting. Tow vehicle has same bulb for lighting stop and turn signals. Use a simple 4 way flat connector to power your 2 light trailer lights or use a custom vehicle specific trailer wiring harness. The basic purpose remains the same whether your truck and trailer is using a 4 way 5 way 6 way or 7 way connector.

Cut the white wire short enough for attachment to the front of the trailer near the connector plug. Standard color code for wiring simple 4 wire trailer lighting question. The white wire must be attached to the trailer in order to ground and power the lights. Shop custom wiring wiring a trailer with a 4 way.

Let s see what types of connectors the trailer light wiring industry uses today. Some vehicles use a combination bulb dual filament for turn and stop. 1 4 wire the first 4 pins white brown yellow green just like the 4 pin connector above. Strip the wire end back about a 1 2 inch and insert it into a terminal with a heat shrink tube.

One to two feet is good. Yellow and green are for left and right turns and braking. Activate each function turn signal brake lights etc in turn and check for a corresponding signal from the circuit tester to make sure you have the right wire. 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.

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. Tow vehicle taillight wiring 2 wire system. Remember that yellow has a l in it so that is the left side brake turn signal and green has a r in it so that is the right side brake turn signal. 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.