Troubleshooting Curt TriFlex Trailer Brake Controller With Erratic Digital Displays

Question:

My controller is showing the bottom part of the L and a . L. Only just the bottom of the L. Remains on with truck off. Battery was dead on the truck prior to this indication. Any thoughts?

asked by: Douglas V

Expert Reply:

I called my contact at Curt and they told me you can possibly reset the brake controller by unplugging the 12V power form it and then let it sit for a few minutes. Then turn it back on and that may take care of the issue. Make sure the trailer is not plugged in when you do this.

Then I recommend checking the trailer plug with the trailer unhooked to see if there is current when the brake controller is off and then check it again when the controller is on.

They said the erratic display almost sounds like you have a short somewhere. It may have originated in the truck. If the display is still messed up, a short could have damaged the controller and it would need to be replaced.

The brake controller is designed to go into power conservation mode after 30-minutes of inactivity so it should not be draining the battery on the truck. I have attached the installation instructions again you can check out.

expert reply by: Jeffrey L