Trailer Wiring Diagram

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.

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.

6 Way Systems, Round Plug. Round 1 1/4" diameter metal connector allows 1 or 2 additional wiring and lighting functions such as back up lights, auxiliary 12v power or electric brakes. Note: The black (sometimes red) 12v and blue electric brakes wire may need to be reversed to suit the trailer. Check with a test light or VOM.

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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.

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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.

Following the standard method for wiring a trailer connector is vital to the safety of your vehicle while towing. Connecting the wrong color wires will result in mismatched taillight functions and confusion on the road. Use this 4-pin trailer wiring diagram to properly wire your 4-wire trailer plug. •

Traditional Trailer + with Brakes = Use a 5-Pin Connector. 1-4 Wire the first 4 pins (White, Brown, Yellow, Green) just like the 4-pin connector above. 5. 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.

Trailer Wiring Diagrams Trailer Wiring Connectors. Various connectors are available from four to seven pins that allow for the transfer of power for the lighting as well as auxiliary functions such as an electric trailer brake controller, backup lights, or a 12V power supply for a winch or interior trailer lights.