4 Pin Trailer Light Wiring Diagram

Hello and welcome to our article on the 4 pin trailer light wiring diagram. If you’re planning to connect the lighting system of your trailer, this guide will provide you with all the necessary information you need. Whether you’re a beginner or an experienced DIY enthusiast, this article will help you understand the wiring diagram and ensure a safe and efficient connection.

1. Understanding the Basics

Before we dive into the details, let’s start by understanding the basics of a 4 pin trailer light wiring diagram. This diagram illustrates the electrical connections between the towing vehicle and the trailer, specifically for the lighting system. It shows how the different wires are connected to the respective functions of the lights, such as brake lights, turn signals, and running lights.

The 4 pin wiring system is commonly used for small trailers, utility trailers, and boat trailers. It consists of four wires, each assigned to a specific function:

Wire Color Function
White Ground
Brown Taillights
Yellow Left Turn/Brake Lights
Green Right Turn/Brake Lights