Recommended 7-Way Wiring Harness for 2021 Chevrolet Blazer RS
Updated 08/03/2021 | Published 08/01/2021
Question:
My Blazer does not have the factory tow package, but there is wiring in the back for a 4 or 7 pin trailer socket. I currently have a 4 pin installed but would like to have a 7 pin. Will the 7 pin work without other modification to the Blazer. I was told I may need to have a Chevy dealer reprogram a computer module in the car to make this work.
asked by: Jim C
Helpful Expert Reply:
In order to get a 7-way connection on your vehicle you should be able to use the factory connector you are talking about which has the connections for your current 4-way and also a 7-way.
I recommend the # 118276 Tekonsha T-One Vehicle Wiring Harness. This custom wiring harness will plug into the OEM wiring harness where your existing 4-way is plugged in right now. No additional modification should be needed for the 7-way connection to work properly. I recommend the Tekonsha over other options since we have found it to be the most reliable.
I have attached an installation video on a 2019 Blazer for your reference.
Product Page this Question was Asked From
Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 7-Way Trailer Connector
- Custom Fit Vehicle Wiring
- Trailer Hitch Wiring
- Vehicle End Connector
- No Converter
- Factory Tow Package
- 7 Blade
- Plug and Lead
- Plug-In
- Visible
- CURT
more information >
Featured Help Information
Instructions
Miscellaneous Media
Continue Researching
- Shop: Trailer Hitch
- Search Results: 7 pin trailer harness
- Shop: etrailer Trailer Hitch Receiver - Custom Fit - Matte Black Finish - Class III - 2"
- Shop: Mounting Bracket and Installation Hardware - Pollak 7-Pole, RV-Style Trailer Connector - Vehicle End
- Shop: Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 7-Way Trailer Connector
- Shop: etrailer Hitch Pin Alignment Collar for Hitch Accessories - 2" Hitches
- Search Results: trailer hitch
- Shop: Curt Powered Tail Light Converter with 4-Pole Flat Trailer Connector
- Q&A: What is the Difference Between a Class II and a Class III Hitch?
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Video: Curt T-Connector Vehicle Wiring Harness Review C56040
- Article: Trailer Wiring Diagrams
- Video: The Low-Down on the Curt Powered Tail Light Converter with 4-Pole Flat Trailer Connector
- Shop: etrailer Trailer Hitch Receiver - Custom Fit - Matte Black Finish - Class III - 2"
- Search Results: trailer wiring
- Q&A: What is the Difference Between a 4-Way and 7-Way Trailer Connector
- Search Results: trailer hitch ball mount
- Video: Clean Up Your Trailer Wiring
- Article: How to Choose the Right Trailer Hitch Class
- Shop: Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way Flat - 10 Gauge Wires
- Q&A: Comparing the Curt Hitch C13416 and EcoHitch Hitch 306-X7396 for a 2019 Toyota RAV4
- Search Results: hitch bike racks
- Video: Curt Powered Tail Light Converter Installation - 2023 Kia Telluride
- Q&A: Trailer Hitch and Wiring for 2027 Kia Telluride
- Article: Trailer Hitch Installation Tips
- Article: My Trailer Hitch Doesn't Fit
- Video: Curt Mounting Bracket for 4-Pole Flat Trailer Connector Review
- Search Results: custom fit vehicle wiring
- Q&A: Clearance Differences Between Hitches For A 2026 Honda Odyssey EX-L
- Search Results: hitch cargo carrier
on Custom Fit Vehicle Wiring
