Troubleshooting Flashing Display of the Curt Discovery Brake Controller part # C84VV

Published 05/23/2014

Question:

We installed this on one of our 2 ton trucks, but the display keeps flashing. It seems to work, just flashes constantly. Any suggestions on what to check?

asked by: Doug G

Expert Reply:

The flashing O.L. message with the Curt Discovery Brake Controller part # C84VV when there is no trailer connected indicates that there is a short somewhere on the brake output circuit. I would check all the connections you made on the blue wire from the controller and then also check the trailer connector at the rear of the vehicle looking for any exposed wire or corrosion and fix as necessary.

If it only flashes O.L. when the trailer is connected the problem is the same as above but its on the trailer side of the wiring. Start at the trailer connector looking for any corrosion or exposed wire and then work your way back to the brake assemblies fixing anything you find wrong.

I attached a couple helpful articles on brake controller installations for you to check out also.

expert reply by: Jameson C