Troubleshooting Not Connected Display on Brake Controller  

Question:

Expert Reply:

A display reading on your brake controller that shows n.c. which changes to . . means there is power to the brake controller, but the trailer is not connected to your vehicle. When your trailer is connected you should not be receiving this message.

The first step that we will want to take is to reset the brake controller. This is done by simply unplugging the brake controller for about 20 seconds and then reconnecting the brake controller.

If the brake controller continues to show n.c., then connect the tow vehicle to a trailer with electric brakes or to a trailer emulator like part # 6562 to see if the n.c. code changes. If the n.c code does not change, there could be an issue with the brake output circuit, or blue wire, between the brake controller and the 7-way connector. I would then recommend using a circuit tester like part # PTW2993 to probe the circuit at different points to see if you find a loss of signal when you apply the manual override and fix any issues that you find.

You should also check the connector on the trailer and the vehicle. If the connector is corroded or damaged, it would explain the problem you are having.

If you do not find any issues with the wiring and power is being sent back to the trailer connector and the n.c. code stays on the display after 15 seconds when there is no trailer connected, then it may be possible that the brake controller is damaged. Unfortunately brake controllers do not have any internally serviceable parts, so the brake controller would need to be replaced.

I am including a link to a video that will show you how to test the wiring on a brake controller.

expert reply by: Chris O

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