![]() ![]() Otherwise, you could put yourself in danger or get yourself pulled over by a cop. Make sure all of the lights work before you take the trailer out on the road. Have a friend help you activate all of the lights while you watch from behind. When all is said and done, you are ready to test the connections. You don’t want to route the power wire from the electrical harness to the battery of your car, or your lights will remain on all the time. The wiring harness will plug or clamp onto the lighting features of the vehicle. If you want to prevent corrosion, you can also add dielectric grease. Make sure you connect the ground wire to a bare, clean metal surface of the frame. With the vehicle, you will perform the same grounding techniques as you used with the trailer. One side runs on the driver’s side of the trailer, while the other is on the passenger side. You can also use a Y (wishbone) harness that will split the running light into two wires. A heat gun and butt connector help to connect the wires securely. With your crimper, you can strip the insulation of the wires. You are now ready to connect the wires to the vehicle. The type of connector you use will depend on your vehicle’s make and model. If there is no 4-way connector on your vehicle, it doesn’t take a lot of work to add one. You can plug the trailer side into the vehicle and get towing. If your car is already equipped with a 4-way connector, you are ready to go. Once the trailer is connected, it’s time to focus on the vehicle. Zip ties and wire clips are also helpful when dealing with loose wires. If needed, you can drill into the frame and install grommets. You want to run the wires along with the hollow parts of the trailer frame. Watch that the wires don’t chafe or get caught along with the components of the trailer, or you could run into problems. Take the remaining wires and run them across the frame of the trailer to the lights. It is responsible for grounding every light and feature running through the harness. There is one ground wire running for the entire wiring harness. ![]() Choose a ground location that doesn’t contain any contamination, corrosion or paint. You will use a ring terminal and self-tapping screw for the connection. The ground wire needs to be connected to a bare, clean portion of the trailer frame. Figure out what parts need to be replaced and what can stay. If you are only replacing a few parts of the wiring and connectors, take an inventory before you get started. I recommend using a trailer lighting kit to ensure everything that you need is included. Gather Suppliesīefore you get started, you need to make sure you have all of the supplies. RELATED: How Much Does a Gooseneck Hitch Installation Cost? How to Install 4-Pin Trailer Wiring 1. Keep in mind that some cars may be wired in another way, so the best and correct way is to always measure the wiring with a multimeter. Here is a picture of how a 4-pin trailer should be wired. With the ground wire, you want to use a minimum of 16-gauge. The colors for a 4-pin trailer wiring diagram are:ġ8-gauge wire is the minimum recommended size for the 4-way plug. However, you should always check the installation manual before proceeding. While the codes might vary slightly between the manufacturers, most of them use the same generic options. 4-Way Trailing Wiring Color Codesīefore you get started on the installation, you must first understand what every color means. This guide also provides simple installation tips to get you moving. I look closer at what the wiring looks like. Don’t forget to test the connection before you hit the road. You will need to perform some installation steps from the trailer side and others from the vehicle side. To get the wiring installed, you must match up the colors and connect the ground wire to the frame. To help you get started, I have some tips for installing 4-pin trailer wiring. ![]() The other pin is used for the ground wire. With the right connection, the running lights, brake lights, and turn signals will all work properly. This special harness is used with most utility and boat trailers. The majority of light-duty trailers are going to use 4-pin wiring. ![]()
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