Wiring Diagram

4 Pin Trailer Plug Wiring Diagram

Traditional trailer with brakes use a 5 pin connector. Installing the 4 pin trailer wires.


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The black sometimes red 12v and blue electric brakes wire may need to be reversed to suit the trailer.

4 pin trailer plug wiring diagram. Yellow and green are for left and right turns and braking. 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. 6 way systems round plug.

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. Check with a test light or vom. 1 4 wire the first 4 pins white brown yellow green just like the 4 pin connector above.

This article shows 4 7 pin trailer wiring diagram connector and step how to wire a trailer harness with color code there are some intricacies involved in wiring a trailer. Use this 4 pin trailer wiring diagram to properly wire your 4 wire trailer plug. Connecting the wrong color wires will result in mismatched taillight functions and confusion on the road.

Start by cutting the white wire and attaching it to the trailer frame. If you follow our trailer wiring diagrams you will get it right. 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.

Some trailers come with different connectors for cars and some have different wiring styles. 4 pin trailer wiring diagram following the standard method for wiring a trailer connector is vital to the safety of your vehicle while towing.


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