5 Wire Trailer Wiring Diagram

Hello and welcome to our comprehensive guide on the 5 wire trailer wiring diagram. In this article, we will discuss everything you need to know about wiring your trailer with a 5 wire system. Whether you are a DIY enthusiast or a professional, this guide will provide you with all the information you need to successfully wire your trailer and ensure its proper functioning.

1. Understanding the Basics

Before we dive into the details, let’s first understand the basics of a 5 wire trailer wiring system. A 5 wire setup consists of five essential components: tail lights, brake lights, left turn signal, right turn signal, and ground wire. Each wire has a specific color code, which we will discuss in the upcoming sections.


  • Provides separate wiring for all the essential components, ensuring individual control and functionality.
  • Offers better stability and reliability compared to a 4 wire system.


  • Requires more complex wiring compared to a 4 wire system.
  • May be more challenging to troubleshoot and repair.

2. Color Coding

The color coding of the wires in a 5 wire trailer wiring diagram is as follows:

Wire Color Function
Brown Tail Lights
Yellow Left Turn Signal
Green Right Turn Signal
Red Brake Lights
White Ground Wire

It is crucial to follow this color coding when wiring your trailer. Using the wrong wire for a specific function can result in malfunctioning lights or even potential accidents.

3. Wiring Process

The wiring process for a 5 wire trailer system involves the following steps:

  1. Identify the wires on your trailer and ensure they match the color coding mentioned above.
  2. Connect the brown wire to the tail lights, ensuring a secure connection.
  3. Connect the yellow wire to the left turn signal, and the green wire to the right turn signal.
  4. Connect the red wire to the brake lights.
  5. Connect the white wire to the ground wire of your trailer.

Make sure to double-check all connections and use electrical tape or wire connectors to secure them properly.

4. Alternative Wiring Diagram

While the 5 wire trailer wiring diagram is the most common and widely used, there is an alternative wiring system called the 7 wire trailer wiring diagram. This system includes additional wires for auxiliary power and backup lights. If you require these additional functionalities, consider using the 7 wire system instead.

5. Frequently Asked Questions (FAQ)

Q: Can I use the same wiring color coding for a different trailer model?

A: It is essential to use the specified color coding for your trailer as mentioned in its manual. Using different color coding can result in improper functionality.

Q: How can I troubleshoot if my trailer lights are not working?

A: Start by checking the connections and ensuring they are secure. Then, use a circuit tester to check if there is power flowing through each wire. If the issue persists, consult a professional or refer to your trailer’s manual.


In conclusion, understanding the 5 wire trailer wiring diagram is crucial for anyone who owns or operates a trailer. By following the correct wiring process and color coding, you can ensure the proper functioning of your trailer lights. Remember to always refer to your trailer’s manual for specific instructions and consult a professional if needed. Safe travels!