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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. Buy a 4 pin wiring kit with wires at least twenty feet in length so its 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 . 4 pin trailer wiring diagram trailer plug adapter 4 pin trailer connector color code 4 wire trailer plug trailer light wiring trailer wiring diagram 7 pin to 4 pin trailer adapter my web site . Wiring your four pin trailer can be challenging if you are doing it for the first time but it is a simple do it yourself task it gets complicated when you have trailers with more wires and in this case you will need an adapter to make the connections the first step in wiring your trailer wires is to first ground the white wire. 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 vehicles wiring system to provide trailer running lights turn signals and brake lights this is