Trailer Wiring Diagram and Installation Help

Custom wiring is the ideal solution for installing trailer light wiring on your vehicle. A custom wiring harness or 'T-connector' is a vehicle-specific harness that plugs in without any spicing required and provides a standard connector output, such as a 4-way flat.

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Installing 4-pin wiring on a trailer is an easy project that takes a few hours or less. 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.

Unplug the driver side taillight wiring harness behind the interior panel. Install the T-connection from the trailer wiring harness between the two sides of the taillight wiring harness by clipping the harnesses together using your fingers. Repeat this process for the passenger side taillight.

How to Install a Trailer Wiring Harness on a 2011 Nissan Frontier. Today on our 2011 Nissan Frontier we'll be installing the Tow Ready Custom Fit Vehicle Wiring Harness with 4-pole flat connector, part number 118525. To begin our install we'll first need to go to the passenger side kick panel and remove the interior panel.

Locate a suitable location for the harness clamp for the four wire trailer light connector and harness underneath the back bumper area. Drill a 1/8 inch hole in the car frame near this location and attach the wiring harness clamp for the light connector with a sheet metal screw.

This 4 wire harness is easy to install and includes a separate brown wire for each right and left light. (Most harnesses only have one wire and require a splice to connect to the second light.) At 25 feet, it is plenty long for almost any trailer.

This vehicle-to-trailer wiring harness creates a standard trailer wiring connection by plugging into vehicle harness and tail light assembly, and then routing the 4-way harness to the rear end of a vehicle. If you own an older vehicle, chances are it will have neither trailer package factory installed nor T-connectors available for it.

Learn how to repair a trailer wiring harness that was damaged when borrowed by someone who did not connect the wiring to their vehicle. This is a very simple and easy repair, but does require a ...

These innovative products allow the trailer wiring harness to pull its power directly from the tail light. Read on to learn how you can start towing safely by installing the proper trailer wiring harness. Figure 1. Trailer wiring harness.