Trailer Brakes Do Not have Enough Brake Holding Power  

Question:

Expert Reply:

At maximum output you should be seeing at least 12 volts or with a test light it should be bright. If adjusting the output does not change the voltage or braking power then there are a few things you can do to determine the issue. First, start by fully applying the manual override and then let it snap back into place. Do this several times to clean the contacts inside the controller.

Next you will need to sever the blue wire a few inches from the back of the controller. Then use your test light to check the end of the blue wire coming from the controller. It should only show power when you apply the manual override. If it shows power without doing anything then there is something wrong inside the controller and it will need to be replaced.

Another thing to check is the trailer connector on the vehicle. Using the test light test your trailer connector pins while someone applies the manual override on the controller. If the signal is not reaching the trailer connector then you know you have a broken wire or loose connection between the controller and the connector.

While you are at the connector, look for and clean off any dirt and corrosion on the trailer connector pins. Also check the back of the connector where the wires attach. Then move on to the trailer and do the same thing with its connector. Make sure that the main trailer connector ground and the brake magnet grounds are attached to clean and corrosion free bare metal surfaces.

Next inspect the brake magnet wiring for any breaks. You can visually inspect the magnets as well. If you can see the winding coming through then the magnets will need to be replaced. You can further test the magnets by following the FAQ I have linked on testing brake magnets.

Make sure that the trailer brakes are properly adjusted as well. The shoes should have a light and constant drag on the drum when you turn the wheel.

expert reply by: Michael H

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