Electric Brake Wiring Diagram Trailer

Hello and welcome to our comprehensive guide on electric brake wiring diagram for trailers. In this article, we will provide you with detailed information on how to properly wire the electric brakes on your trailer. Whether you are a seasoned DIY enthusiast or a beginner, this guide will help you understand the process and ensure the safety and functionality of your trailer’s braking system.

1. Understanding the Basics

Before we delve into the wiring diagram, it’s important to have a basic understanding of how electric brakes work. Electric brakes are activated when the brake pedal is pressed in the towing vehicle, sending an electrical signal to the trailer’s braking system. This signal then activates the brake magnets, which apply pressure to the brake drums or rotors, thus slowing down or stopping the trailer.


  • Responsive braking: Electric brakes provide quick and responsive braking, allowing for safer towing.
  • Adjustability: The braking force can be adjusted according to the weight of the trailer, providing better control.
  • Less wear and tear: Electric brakes distribute braking force evenly, reducing wear on the towing vehicle’s brakes.


  • Initial setup: Installing electric brakes requires some technical knowledge and wiring expertise.
  • Additional components: Electric brakes require additional components such as brake controllers and breakaway systems.
  • Maintenance: Regular inspection and maintenance are necessary to ensure the proper functioning of electric brakes.

2. Components Needed

Before starting the wiring process, make sure you have all the necessary components. These include:

Component Description
Brake controller Device that sends electrical signals to the trailer’s braking system.
Breakaway system Emergency braking system that activates if the trailer becomes detached from the towing vehicle.
Trailer brakes Brake drums or rotors with brake magnets attached.
Wiring harness Set of wires and connectors needed to connect the brake controller to the trailer’s braking system.

3. Wiring Diagram

Now let’s take a look at the wiring diagram for electric brakes on a trailer:

Electric Brake Wiring DiagramSource: None

It is crucial to follow the specific wiring diagram for your trailer’s braking system. The diagram will indicate the appropriate wire colors and connections for each component. Ensure that all connections are secure and properly insulated to prevent any electrical shorts or malfunctions.

4. Step-by-Step Installation

Here is a step-by-step guide to installing electric brakes on your trailer:

  1. Mount the brake controller in a convenient location inside the towing vehicle.
  2. Connect the wiring harness to the brake controller according to the manufacturer’s instructions.
  3. Route the wiring harness from the brake controller to the rear of the towing vehicle.
  4. Connect the wiring harness to the trailer’s braking system, following the wiring diagram.
  5. Test the brakes to ensure proper functionality.

5. Alternative Wiring Option

If your trailer already has hydraulic surge brakes, you may consider using an electric over hydraulic (EOH) conversion kit. This kit allows you to convert your surge brakes to electric brakes, providing additional control and responsiveness.

Frequently Asked Questions

Q: How often should I inspect my trailer’s electric brakes?

A: It is recommended to inspect your trailer’s electric brakes at least once a year or before any long trips. Regular maintenance will ensure their optimal performance and safety.

Q: Can I install electric brakes myself?

A: Yes, you can install electric brakes yourself if you have the necessary tools and knowledge. However, if you are not confident in your abilities, it is best to seek professional assistance.


In conclusion, understanding the electric brake wiring diagram for trailers is crucial for safe and efficient towing. By following the correct wiring procedures and using the right components, you can ensure the proper functioning of your trailer’s braking system. Regular maintenance and inspections will further enhance the longevity and reliability of the electric brakes. Remember, safety should always be the top priority when towing a trailer, and properly installed and maintained brakes are essential for a smooth and secure towing experience.