Troubleshooting Primus IQ Brake Controller That Shows Random Numbers on Highway
Updated 06/15/2018 | Published 06/13/2018
Question:
I believe I have set the power level correctly. What number should I see on the controller while driving? It seems to change as I am moving.
asked by: Niels N
Expert Reply:
If you have a proportional brake controller like the Primus IQ part # TK90160 installed and you are seeing numbers change randomly as you are driving that indicates that you have a short between the red wire of the controller and a 12 volt power source that's basically tricking the controller into thinking you have the brakes on and to look for deceleration.
Go over the connections of the red and black wires making sure that the red wire is only connected to a circuit that sees power when the brakes are applied.
Continue Researching
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Article: Brake Controller Installation: Starting from Scratch
- Q&A: Availability Of Brake Controller For Factory EBC Plug On 2025 Ford Ranger With Factory Tow Package
- Q&A: Primus IQ Brake Controller Wiring Functions
- Article: Wiring Trailer Lights with a 7-Way Plug (It's Easier Than You Think)
- Q&A: What is the Difference Between the Tekonsha Prodigy P2 and the P3 Brake Controllers
- Article: Towing a Trailer? Let's Talk About Brake Controllers
- Q&A: What is the Difference Between a 4-Way and 7-Way Trailer Connector
- Q&A: Parts Needed To Install Trailer Hitch, 7-Way And Brake Controller On 2018 Chevy Express 3500 Van
- Q&A: Parts Needed to Add 7 Way Connector to 2013 Ford F-150 XL
- Article: Trailer Wiring Diagrams
- Q&A: Parts Needed to Install Brake Controller in 2020 Ford F-150
- Article: Parts Needed to Add Electric Drum Brakes to a Trailer
- Article: Installing an Electric Brake Controller on 2007-2013 GM Full-Size Truck or 2007-Present GM SUV