4 Wire Trailer Tail Light Wiring Diagram

By | February 28, 2022



Are you perplexed by the wiring on your trailer’s tail light system? This guide will help shed some light on understanding 4-wire trailer tail light wiring diagrams.

When you drive down the highway in the dark of night, what do you rely on most for safety? The answer is tail lights! Tail lights are designed to keep you safe and visible on the road. Knowing how to properly wire up your trailer's tail lights isn't just about safety—it's about achieving the right look for your trailer too.

A 4-wire trailer tail light wiring diagram is the most common type of wiring for tow vehicles. It consists of four colored wires—red for brake lights, yellow for left turn signal, green for right turn signal, and brown for running lights. To properly wire a trailer, you'll need to know the specific functions of each color wire.

The red wire is used for the brake lights. When the brakes are applied, the red wire sends power to both sides of the trailer, which lights up the brake lights. The yellow wire provides power to the left turn signal. This wire sends power to the left turn signal indicator and then to the trailer. The green wire does the same for the right turn signal, and the brown wire powers the running lights. Wiring these three colors together allows both sides of the trailer to light up when either brake or turn signal is activated.

Knowing how to wire your trailer can save you a lot of time and money in the long run, not to mention providing you with peace of mind knowing that your trailer is properly wired. Before you attempt any wiring job, it is always advised to consult your vehicle manual, or a professional installer to make sure that you have the correct wiring diagram and connect the right wires to the right places. With the right guidance and a little practice, understanding 4-wire trailer tail light wiring diagrams can be a breeze!


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