Molly Ayala
Clicking noises in electric trailer brakes are often caused by magnets engaging the hub to force the brake shoes apart. This is a normal occurrence, and a humming sound may also be heard while the brakes are engaged. However, if the clicking noise is accompanied by weak braking action, it could be due to a faulty ground wire in the main wiring harness, which can limit the amperage delivered to the brakes. In some cases, it may be necessary to replace the battery in the trailer to resolve the issue.
| Characteristics | Values |
|---|---|
| Clicking noise when brakes are engaged | Normal, caused by magnets forcing the brake shoes apart |
| Weak brakes | Faulty wiring, low voltage, or worn-out brakes |
| Locked brakes | Faulty wiring, brake controller issues, or compatibility issues |
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What You'll Learn
Wiring issues
One possible wiring issue is a faulty connection between the trailer and the tow vehicle. This can be caused by incompatible wiring harnesses, resulting in incorrect voltage being supplied to the trailer brakes. For instance, if the trailer is wired differently from the adapter, it may receive 12 volts as soon as it is plugged in, leading to immediate brake lock-up. To resolve this, you can use a universal adapter that can be wired either way, ensuring proper voltage control.
Another wiring issue could be related to the brake output wire, which may be shorting out to the frame or neighbouring wires. This can cause the brakes to lock up unexpectedly. To address this, carefully inspect the trailer side connector for any signs of corrosion or damage that could be causing the short circuit. Clean or replace any affected components, and if necessary, trace the wiring to locate and fix the short.
In some cases, the problem may lie with the ground wire in the trailer wiring harness. A faulty or broken ground wire can limit the amperage delivered to the brakes, resulting in weak or ineffective braking. Inspect the ground wire for any damage or breaks, and replace the wiring harness if necessary.
Additionally, wiring issues can also be caused by faulty connectors, such as a flat 5-pin connector or a 7-pin trailer light plug. These connectors play a crucial role in operating the trailer brakes, especially when reversing. If faulty, they can engage the trailer surge brakes unexpectedly, leading to lock-up. Replacing these faulty connectors is often the recommended solution.
It is important to note that wiring issues can be complex and may require further investigation beyond the suggestions provided here. Consulting a professional or seeking specialised advice for your specific trailer and towing setup may be necessary to ensure a safe and effective resolution.
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Faulty brake controller
A faulty brake controller can cause a lot of issues with your trailer brakes, and in some cases, it can even be dangerous. Here are some common problems associated with a faulty brake controller:
Incompatible Wiring
If the wiring between your vehicle and the trailer is incompatible, the wrong current voltage can be supplied to the trailer brakes. This can cause the brakes to engage harder than they should, leading to lock-ups. This issue can often be resolved by adding a trailer wire connector or adaptor to control the voltage. In some cases, you may need to modify your vehicle's wiring harness to improve the connection.
Incorrect Brake Controller Settings
If the brake controller's boost or gain is set too high for the size of the trailer, it can cause the brakes to apply too aggressively. Adjusting the settings to match the performance of the trailer brakes is crucial to avoid this issue.
Power Supply Issues
If your brake controller isn't receiving power, it may be due to a blown fuse or a loose connection. Check your fuse box and replace any blown fuses. Inspect the wiring from the controller to the battery for loose connections or frays, and repair or replace any damaged wiring.
Poor Ground Connection
A poor ground connection can also cause brake controller issues. Ensure the ground wire is securely connected to your vehicle's chassis and that the connection is clean and free of corrosion. A faulty ground connection can disrupt the electrical signal sent by the brake controller to engage the trailer brakes.
Short in the Brake Signal Wire
If the display on your brake controller shows "trailer not connected," it could be due to a short in the brake signal wire. This issue may also be caused by corrosion in the trailer or vehicle plug.
Constant Power to the Brake Output Wire
The blue wire coming from the brake controller to the trailer brakes should only have power when the brakes are applied or the manual override is engaged. If there is constant power running through this wire, it indicates a faulty brake controller that needs replacement.
It's important to consult your owner's manual and perform thorough inspections and maintenance of your brake system to identify and resolve any issues related to a faulty brake controller.
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Faulty flat 5-pin connector
A faulty flat 5-pin connector can cause issues with your trailer brakes, potentially leading to them locking up. This type of connector is commonly used in trailers with electric brakes and plays a crucial role in operating the trailer brakes when reversing with a trailer attached.
The 5-pin connector is similar to the 4-pin connector but adds an extra wire, typically blue, for the reverse lights or backup lights. This 5th wire can also be used for electric trailer brakes or interacting with surge brakes. In the context of trailer brakes, the 5th pin serves as the tow vehicle's reverse lead.
If the flat 5-pin connector is faulty, it can inadvertently activate the trailer surge brakes when you shift into reverse. This issue can be resolved by replacing the faulty connector with a new one. It is important to ensure that the replacement connector is compatible with your trailer's wiring harness to avoid voltage issues that could lead to improper brake engagement.
To prevent compatibility issues, it is recommended to use a circuit tester to match pins by function, as wire colours can vary between different trailers. Additionally, you can use a trailer wire connector or adaptor to help regulate voltage and improve the connection between your vehicle and the trailer.
It is important to address issues with the flat 5-pin connector promptly to ensure safe and proper functioning of your trailer brakes. Regular maintenance and compatibility checks can help prevent unexpected problems and ensure a smooth towing experience.
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Faulty 7-pin trailer light plug
A faulty 7-pin trailer light plug can cause issues with the trailer's brakes and lights. The 7-pin plug is responsible for the proper functioning of the trailer's indicators, brake lights, and turn signals. If the plug is faulty, it can lead to the trailer brakes locking up when reversing. This is because the plug plays a pivotal role in operating the trailer brakes when reversing with a trailer attached.
One common issue with the 7-pin trailer light plug is corrosion on the pins due to exposure to water. This can cause flickering or non-functional tail lights. To resolve this issue, users can clean the corrosion off the pins with sandpaper or an electrical contact cleaner spray.
Another potential issue is a loose connection between the truck's wiring harness and the plug. Ensuring that the connector is fully seated can help resolve issues with the trailer lights and brakes. In some cases, the entire connection housing may be faulty and require replacement.
It is also possible for the 7-pin trailer light plug to not receive the required 12 volts when the brake is pressed. This can be due to issues with the brake controller or a faulty connection. Users can test the voltage with a 7-pin tester to identify the source of the issue.
If the 7-pin trailer light plug is faulty, it is recommended to replace it with a new one. Additionally, users can use a lock-out key or a nickel to deactivate the trailer brakes when reversing, allowing for temporary use until the faulty plug is replaced.
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Normal clicking noise
A clicking noise when the electric trailer brakes are first engaged is normal. This sound is produced by the magnets engaging the hub to force the brake shoes apart. You may also hear a humming sound while the brakes are engaged, which is also normal. When the brakes are engaged, you might hear a "clack" or "metaly" sound, which is also perfectly normal.
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Frequently asked questions
A clicking noise when the brakes are first engaged is normal. It is the sound of magnets forcing the brake shoes apart.
This could be due to wiring issues. If the trailer is wired differently from the adapter, the brakes may receive 12 volts as soon as it is plugged in.
A faulty flat 5-pin connector or 7-pin trailer light plug might be causing the trailer brakes to engage when reversing.
First, disconnect the trailer from the vehicle and test the connector. Then, inspect the wiring for any signs of corrosion or exposed wires. Replace any damaged sections.
There could be a problem with the ground wire. Check if the wire is broken or damaged and replace it if necessary.
