Beatrice Lang
Electric trailer brakes are a crucial safety feature for any trailer, and setting them up correctly is essential to ensure they function properly. The process involves carefully connecting the trailer's brake circuit to the vehicle's electrical system, ensuring that the brakes can be activated effectively when needed. While the specific steps may vary depending on the trailer and vehicle, the fundamental principles of wiring electric trailer brakes remain consistent. This includes considerations such as wire gauge, connector types, and the placement of the brake controller.
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What You'll Learn
Check for a brake flange at the base of the spindle
To hook up electric trailer brakes, one of the first things to check is whether your trailer axle is equipped with a brake flange at the base of the spindle. This is important because the brake flange serves as the mounting point for the brake assembly.
If your trailer axle does not have a brake flange, you have a couple of options. One option is to weld a brake flange onto the spindle. However, welding a brake flange onto a spindle is not a simple task and is not recommended for inexperienced individuals. It requires specialized equipment and precision to ensure that the flange is welded on concentrically and squarely. The flange must be welded at a true 90-degree angle from the spindle, and the gap around the spindle must be consistent for 360 degrees. Improper welding can lead to reduced braking performance and uneven brake wear.
The other option is to replace the entire axle with one that already includes mounting flanges. This option is often chosen due to the challenges and potential expenses associated with finding the right tools and skilled workers for welding.
If your trailer axle already has a brake flange, you can proceed with mounting the brake assembly. The correct brake mounting flange will depend on the diameter of your axle. For example, a 3,500-pound axle typically uses a 10-inch drum, while a 2,000-pound axle typically uses a 7-inch drum.
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Identify the wires and their connections
Before you begin to wire your trailer's electric brakes, you must identify the wires and their connections. This is a crucial step to ensure the correct functioning of your trailer brakes.
Firstly, you need to determine the type of wiring harness you have. The most common types are 4-wire and 7-wire harnesses. A 4-wire harness typically includes green, yellow, brown, and white wires. However, if you have a 4-wire harness, it will need to be upgraded to a 7-wire harness to accommodate the additional brake functions.
Now, let's discuss the wiring for the electric trailer brakes. There are usually two wires coming from the brake circuit, which need to be attached to the two wires emerging from the backing plate. This connection ensures the proper functioning of the brakes.
Additionally, it is essential to understand the concept of polarity. In this context, the term "polarity" refers to the positive and negative terminals of the electrical circuit. The positive wire, often marked as 12VDC, carries power to the brakes, while the negative wire, or ground wire, completes the electrical circuit. These wires typically run along the roadside trailer frame rail and play a crucial role in activating the brakes.
Finally, let's talk about the connection to the trailer. The trailer brake wiring is connected to what is known as an umbilical connector. This connector acts as the interface between the trailer and the vehicle's electrical system. It is important to ensure that the wiring matches the connector configuration, whether it be a 4-pin or 7-pin connector, to guarantee proper functionality.
By carefully identifying and understanding the wires and their connections, you can ensure the safe and effective operation of your electric trailer brakes.
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Use a 7-pin connector to wire brake functions
To wire brake functions using a 7-pin connector, you need to understand the colour coding of the wires and their functions. The blue wire is typically used for electric brakes, but it can also be used to disable hydraulic surge brakes or for backup lights. The red wire is for the left turn/left brake lamp, and the brown wire is for the right turn/right brake lamp. The black wire is for the 12V accessory feed to the trailer, and the green wire is for the running lamp circuit. The yellow wire is for the reverse lamps, and the white wire grounds to the trailer frame.
When wiring electric trailer brakes with a 7-way connector, you will need to connect one wire from each assembly to the trailer frame and the other to the brake output circuit. You can use a circuit tester to activate each function (turn signal, brake lights, etc.) and check for a corresponding signal to ensure you have the right wire. If you are using a 7-pin connector with a 4-pin trailer plug, you can use a 4-pin to 7-pin trailer wiring adapter. This will plug into the 4-pin connector and provide the 7-pin socket for the trailer.
It is important to note that the wiring depends on your electrical needs. While all trailers need lights such as brake lights, turn signals, and tail lights, some have additional requirements like electric brakes or auxiliary power. If you are installing electric brakes, you will need to connect one of the wires to the brake controller output wire on your trailer connector, and the other wire will need to be grounded.
When using a 7-pin connector, you can tap into the existing wiring if your trailer has 7 wires running back to the brakes. Each brake will have two wires: one for 12-volt power and the other for the brake magnet. You can also use a mounting bracket to attach the connector to the vehicle, preventing damage if it is left dangling. Additionally, applying a small amount of grease to all electrical connections can help prevent corrosion.
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Install a brake controller
To install a brake controller, you must first disconnect the negative battery cable. This is a safety precaution that will protect you from injury and prevent damage to your vehicle's electronics. Move the cable off to the side.
Next, you need to find a suitable mounting location for the brake controller. It should be easily visible and accessible to the driver but not obstructing the view of the road or other controls. On most vehicles, this will be below and off to the side of the steering wheel.
With the brake controller in position, use the mounting bracket as a template to mark the spots where you will need to drill. Drill a hole for each of the fasteners included with the bracket, being mindful not to damage any vehicle electronics behind the dash. Reposition the brake controller bracket and install the fasteners. Many brake controllers come with self-tapping screws, so be careful not to overtighten or strip out the holes.
Attach the brake controller to the bracket using the included bolts. Using a vehicle-specific wiring harness, plug one end of the harness into the vehicle's factory harness under the dash, and the other end into the brake controller.
The final step is to supply power to the brake controller unit. Locate the factory power feed wire under the hood, near the fuse box, and attach it to the auxiliary power terminal on the fuse box.
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Test the brakes
Testing the brakes on your electric trailer braking system is a critical step in ensuring your safety on the road. Here's a detailed guide on how to do it:
Jack Up the Axle and Disconnect the Breakaway Pin
Begin by jacking up the trailer's axle. This will give you access to the components of the braking system and allow you to simulate a rolling motion during the test. Once the axle is securely raised, locate the breakaway pin and carefully disconnect it. This pin is an essential safety feature that activates the trailer's brakes if it ever becomes detached from the towing vehicle.
Spin the Tire and Observe Lockup
With the breakaway pin disconnected, proceed to spin the tire. A properly functioning trailer brake system should cause the tire to lock up when spun. This indicates that the braking mechanism is engaging as intended. Ensure that you spin the tire slowly and carefully to avoid any potential hazards.
Check for Voltage at the Magnets
Inspect the voltage at the magnets within the braking system. The electric trailer brakes typically have two wires on each wheel hub, and it's important to ensure that voltage is reaching these magnets. This verification step ensures that the electrical circuit is complete and functioning correctly.
Verify Brake Controller Operation
The brake controller is the heart of your electric trailer brake system. It's crucial to ensure that it's functioning correctly. Refer to the specific instructions provided with your brake controller unit to perform a test of its operation. This may involve checking the continuity of the wiring harness and verifying that the controller is receiving the correct power supply.
Test Drive
Finally, conduct a test drive with the trailer attached to your vehicle. Drive at a slow speed in a safe area and apply the trailer brakes independently from your vehicle's brakes. Observe the trailer's response and ensure that it slows down and comes to a complete stop as expected. Ensure you perform this test in a controlled environment free from hazards.
Remember, safety should always be your top priority when working on and testing trailer brake systems. If you're ever unsure or uncomfortable with any aspect of the testing process, don't hesitate to consult a professional or seek advice from a reputable trailer maintenance source.
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Frequently asked questions
Before installing electric trailer brakes, ensure that your axle has a brake flange at the base of the spindle.
The most common wire harness for electric trailer brakes is a 7-pin round trailer electric connector.
Trailer brake wires typically have a voltage of 12VDC, with one wire being positive and the other negative (ground).
It is recommended to use 10-gauge wire for trailer brake circuits as it is more than enough and provides extra caution.
