Tips for Installing 4

Buy a 4-pin wiring kit with wires at least twenty feet in length, so it's long enough for your trailer. The most common wire thickness for a trailer is 16 gauge, but I bought thicker wiring for added durability. Depending on the size of your trailer and the number of lights, you might want to check on the Internet for the recommended gauge for your specific trailer.

Installing the 4-Pin Trailer Wires. 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. Yellow and green are for left and right turns and braking. Start by cutting the white wire and attaching it to the trailer frame.

The ground wire should be run from the frame of the vehicle to the trailer. There must be a very consistent metal to metal contact for the ground wire. So, do not run the wire from the bumper or the hitch of the car. The 4-pin standard flat style connector has four contacts with a male pin on the vehicle side for the ground. Wiring the 4-pin ...

Cut the four-pin plug off of the trailer harness. Verify the harness color codes at each tail light. There should be a common color for both the tail lights. The left and right turn signal lights should each have a different color. This accounts for three of the colors in the wiring harness. The remaining color is the ground wire.

Above we have describes the main types of trailer wiring diagrams. Below is the generic schematic of how the wiring goes. 4 pin trailer wiring diagram. This type of connector is normally found on UTVs, ATVs and trailers that do not have their own braking system. Note, that this type of 4-pin connector is less common, that 4-pin flat connector.

Trailer electrical connectors come in a variety of shapes and sizes. The basic purpose remains the same whether your truck and trailer is using a 4-way, 5-way, 6-way or 7-way connector. By law, trailer lighting must be connected into the tow vehicle's wiring system to provide trailer running lights, turn signals and brake lights.

5-pin trailer wiring is very similar to 4-pin wiring, but it adds in a blue wire for the reverse or backup lights. Not all trailers have reverse lights, so consider your own trailer as you wire in a 5-way plug. •

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