Curt Discovery Trailer Brake Controller # C84VV Displays Only a Red Dot After Installation
Question:
I wired the curt discovery in my 11 Silverado and all I get is a red dot
asked by: Greg J
Expert Reply:
If your Curt Discovery Trailer Brake Controller # C84VV displays only a red dot when you do NOT have a trailer connected then this indicates that the controller's red (input signal) wire is connected to the wrong side of the brake light switch. This red wire should connect to the COLD side of the switch that has power only when you press the brake pedal.
If your Discovery displays the red dot when you DO have a trailer connected then this usually indicates a problem in the trailer brake circuit wiring. In this case the controller cannot "see" the trailer brake magnets.
Check both your vehicle and trailer connectors for discolored, corroded or bent contacts on the brake circuit pins. Clean or repair as needed. Check that the vehicle and trailer main harness ground wires are solidly attached to a clean bare metal surface. You can also check the brake wiring itself to make sure that each brake assembly is properly grounded to the trailer frame.
If none of these checks reveal the problem you can also test your brakes directly by applying power from a spare battery direct to the contacts on the trailer's plug. If your brakes engage fully (as they should when you hit them with a full 12 volts) then you can move on to the truck wiring as the likely source for the problem.
Product Page this Question was Asked From
Curt Discovery NEXT Trailer Brake Controller - 1 to 4 Axles - Time Delayed
- Trailer Brake Controller
- Time Delayed Controller
- Electric
- Electric over Hydraulic
- Automatic Leveling
- Under-Dash Box
- Dash Mount
- Up to 4 Axles
- LCD Display
- Up to 360 Degrees
- CURT
more information >
Featured Help Information
Instructions
Miscellaneous Media
Continue Researching
- Shop: Brake Controller
- Q&A: Curt Discovery Brake Controller Is Only Showing A Dot When Engaging Manual Override
- Article: Troubleshooting Brake Controller Installations
- Q&A: Troubleshooting Trailer Brake Controller that Only Functions When Engine Isnt Running
- Shop: Replacement Brake Control Plug-In Harness for Tekonsha and Draw-Tite Brake Controller 12" Long
- Q&A: Troubleshooting No Power on the Blue Brake Output Wire from a Brake Controller
- Q&A: How to Wire Electric Brakes on a Tandem Axle Trailer
- Q&A: How to Properly Set Up Curt Discovery Time Delayed Brake Controller
- Shop: Curt Echo Wireless Brake Controller - 7-Way Plug Mount w/ Bluetooth App - 1 to 2 Axle - Proportional
- Shop: etrailer Electric Trailer Brakes - 10" - Left/Right Hand Assemblies - 3,500 lbs
- Shop: Curt Custom Wiring Adapter for Trailer Brake Controllers - Dual Plug In
- Shop: Dexter Electric Trailer Brakes - 12" - Left/Right Hand Assemblies - 6,000 lbs
- Shop: etrailer Electric Trailer Brakes - 12" - Left/Right Hand Assemblies - 5,200 lbs to 7,000 lbs
- Q&A: Is Clicking Sound Normal for Curt Brake Controller When Brake Pedal is Pressed
- Q&A: Help! Curt Discovery Trailer Brake Controller # C84VV Only Shows Decimal When Brake is Applied
- Video: Trailer Brake Controller Wire Testing
- Shop: Derale Series 9000 Plate-Fin Transmission Cooler Kit w/ NPT Inlets - Class I -Extra Efficient
- Shop: Transmission Cooler
- Article: Towing a Trailer? Let's Talk About Brake Controllers
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Video: Curt Spectrum Trailer Brake Controller Installation - 2021 Jeep Gladiator
- Article: Installing an Electric Brake Controller on 2007-2013 GM Full-Size Truck or 2007-Present GM SUV
- Video: Choosing the Right Brake Controller
- Search Results: 25580
- Article: Trailer Wiring Diagrams
- Shop: Trailer Hitch
- Video: Choosing the Right Trailer Wiring
- Shop: Trailer Wiring
- Search Results: 44649
- Article: How to Choose the Right Trailer Hitch Class
on Trailer Brake Controller
