Troubleshooting Curt Brake Controller Installation in 2007 GMC Sierra New Body Style
Question:
Hi, Why am I getting a constant 12 V at the bumper plug? Key on or off does not make a difference. I have the curt controller connected. Unplug the controller and 0 VDC
asked by: Dennis N
Expert Reply:
First I suggest making sure you are testing the brake circuit pin on your Sierra's 7-way trailer socket. If you refer to the linked photo of a trailer connector you will note the brake controller's output is carried on the pin at the 5:00 position; the ground is at the 7:00 position.
If you happened to test the 12V auxiliary power circuit, carried on the pin at the 2:00 position, it will have power at all times.
I see that you purchased Curt Universal Wiring Adapter # C51515 which installs via hardwiring. It is possible the red input signal wire is connected to the wrong wire. This red wire needs to connect to the COLD side of the switch, to the wire that carries +12V ONLY when the brake pedal is pressed and at no other time. In your truck this should be a light blue or orange wire as noted in the linked article which explains brake controller installation in your truck.
Product Page this Question was Asked From
Universal Wiring Adapter for Curt Trailer Brake Controllers
- Accessories and Parts
- Trailer Brake Controller
- Wiring Adapter
- Plugs into Brake Controller
- Universal
- CURT
more information >
Continue Researching
- Shop: Brake Controller
- Shop: Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way Flat - 10 Gauge Wires
- Shop: Trailer Wiring
- Search Results: c94vv
- Shop: Trailer Hitch
- Video: etrailer Trailer Brake Controller 7-Way RV Upgrade Kit Installation - 2023 Toyota Highlander
- Shop: Curt True Course Advanced Bluetooth Trailer Sway Control - 1 to 4 Axles
- Shop: Curt Echo Wireless Brake Controller - 7-Way Plug Mount w/ Bluetooth App - 1 to 2 Axle - Proportional
- Q&A: Wiring Diagram for the Curt Universal Brake Controller Harness
- Q&A: Parts Needed to Add 7-Way and Brake Controller on 2017 Subaru Outback Wagon
- Q&A: Wiring Diagram for Curt Echo Under-Dash Trailer Brake Controller
- Search Results: tekonsha prodigy rf
- Shop: Curt Echo Under-Dash Bluetooth Brake Controller w/ OneControl App - 1 to 4 Axles - Proportional
- Shop: 7-Way RV Upgrade Kit for Trailer Brake Controller Installation - 12 Gauge Wires
- Shop: Performance Chip Tuners
- Shop: Curt Trailer Connector Adapter with Backup Alarm - 4-Way to 7-Way RV and 4-Way Flat
- Shop: Curt Spectrum Trailer Brake Controller - Dash Mounted Knob - 1 to 4 Axles - Proportional
- Video: Curt Brake Controller C51515 Review
- Video: Review of etrailer - Brake Controller - ETBC7
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Video: Tekonsha Prodigy P3 Trailer Brake Controller Review
- Video: Choosing the Right Brake Controller
- Article: Brake Controller Installation: Starting from Scratch
- Q&A: Parts Needed to Install Curt C49UR Assure Brake Controller on 2021 Chevy Silverado
- Search Results: electric brake controller
- Video: Trailer Brake Controller Installation - 2012 Toyota Tundra
- Video: Trailer Brake Controller Installation - 2008 Toyota Tacoma 90185
- Search Results: 90160
- Search Results: c51515
- Shop: Towing Mirrors