4 Prong Trailer Wiring Diagram

As the name implies they use four wires to carry out the vital lighting functions.

4 prong trailer wiring diagram. Three wires are for the trailer while the last wire is the ground wire. The four wires control the turn signals brake lights and taillights or running lights. Connecting the wrong color wires will result in mismatched taillight functions and confusion on the road. The red and blue wire can be used for brake control or auxiliary.

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. Assortment of 5 wire to 4 wire trailer wiring diagram. Installing 4 pin wiring on a trailer is an easy project that takes a few hours or less. A wiring diagram is a streamlined traditional pictorial representation of an electrical circuit.

Many trailers have three circuits. 1 4 wire the first 4 pins white brown yellow green just like the 4 pin connector above. 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. The circuits are for left and right brake lights and running lights.

Traditional trailer with brakes use a 5 pin connector. They also provide a wire for a ground connection. It shows the components of the circuit as streamlined shapes and the power and signal connections between the devices. To connect the electric system of your trailer to the vehicle you will be using special connector.

Start by cutting the white wire and attaching it to the trailer frame. 4 pin trailer light wiring diagram. Above we have describes the main types of trailer wiring diagrams. 3 4 inch by 1 inch 6 way rectangle connectors right turn signal green left turn signal yellow taillight brown ground white.

4 pin trailer wiring diagram. 4 way trailer connectors are typically used on small trailers such as boat snowmobile utility and other trailers that that do not use brakes. 4 pin trailer wiring diagram following the standard method for wiring a trailer connector is vital to the safety of your vehicle while towing. 4 pin connectors are the standard used for most trailers.

Below is the generic schematic of how the wiring goes. I had no choice but to install the wiring while my boat was on the trailer and having to work underneath my boat made the job a little more difficult but if your trailer is empty installation is much easier. Yellow and green are for left and right turns and braking. Installing the 4 pin trailer wires.