Troubleshooting Right Turn/Stop Circuit Not Working on 7-Way
Updated 01/19/2026 | Published 08/03/2024
Question:
On my 2006 GMC sierra 1500, My 7 pin trailer connector everything works, except I’m not getting a brake light through the green terminal, which is for the right turn signal and brake light. Everything else works what What could be the problem?
asked by: Steve
Expert Reply:
Hey Steve, first thing to check is try cleaning the pins of the 7-way with sandpaper as it's pretty common for dirt or corrosion to cause this problem. Next check the wiring behind the 7-way and see if there's anything there you can clean up.
Next check fuses under the hood of the Sierra. It could also be a problem with the 7-way which we have with the part # HM40975 as a replacement.
Product Page this Question was Asked From
7- and 4-Pole Trailer Connector Socket w/ Mounting Bracket - Vehicle End
- Custom Fit Vehicle Wiring
- Trailer Hitch Wiring
- Vehicle End Connector
- No Converter
- No Tow Package
- 4 Flat
- 7 Blade
- Plug Only
- Pollak
more information >
Continue Researching
- Search Results: backup camera
- Search Results: overload pads vehicle suspension
- Search Results: tailgate camera
- Shop: Trailer Wiring
- Shop: 7-Way Vehicle Power Adapter for Furrion RV Observation Camera
- Shop: Custer Trailer Connector Adapter - 7-Way Round to 7-Way Blade
- Search Results: 7 way round to 7 way blade
- Search Results: 7 way to 7 way extension
- Q&A: Troubleshooting 7-Way of 2022 Chevy Silverado that Shows No Voltage at Connector
- Video: Checking Out the Custer Trailer Connector Adapter w/ Dust Cover
- Video: In-Depth Review of the 7-Way Vehicle Power Adapter for Furrion RV Observation Camera
- Video: Detailed Breakdown of the Custer Trailer Connector Adapter
- Shop: Replacement Power Cable for Furrion Vision 1, Vision 2, and Vision S Doorway Camera Brackets
- Shop: Custer Trailer Connector Adapter w/ Dust Cover - 7-Pole Round Pin to 7-Way Blade
- Shop: Curt Powered Tail Light Converter with 4-Pole Flat Trailer Connector
- Shop: Trailer Hitch
- Search Results: trailer hitch
- Video: Firestone Ride-Rite Air Bags with Easy Mount Compressor Feature Breakdown
- Q&A: What is the Difference Between a Class II and a Class III Hitch?
- Article: Trailer Wiring Diagrams
- Q&A: What is the Difference Between a 4-Way and 7-Way Trailer Connector
- Search Results: trailer wiring
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Shop: etrailer Anti-Rattle Hitch Collar for 2" Hitch Receivers
- Q&A: Does etrailer Carry Furrion Chill Cube w/ Heat Pump to Replace Dometic Duo-Therm
- Shop: Suspension Enhancement
- Shop: Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way Flat - 10 Gauge Wires
- Video: One Year Later | Firestone Airide Helper Springs and Heavy Duty Air Compressor
- Article: How to Measure for Trailer Hitch Drop
- Q&A: Lug Nut Torque Chart for Trailer Wheels
on Custom Fit Vehicle Wiring
Jameson C.
1/19/2026
Hey Steve, did cleaning the pins or checking the wiring behind the 7-way fix the brake light issue on your Sierra? Knowing what solved it could really help others chasing the same problem.