Trailer Wiring and Brak Controller Recommendation for a Semi Truck
Updated 12/22/2025 | Published 10/05/2024
Products Featured in This Question
Question:
Hello, Can you recommend some products that allow a Semi truck - air breaks to control an electric break trailer breaks and lights?
asked by: Keith
Expert Reply:
Thanks for reaching out, Keith!
Semis have different functions for their wiring connectors so we'll essentially need to "start from scratch" using the following:
- Universal 4-Way # 119147KIT
- Universal Upgrade # ETBC7
This gives you the correct functions as well as the wiring needed to get a break controller installed.
For the brake controller itself you'll need the Hayes # HA100400C which ties into standard brake controller functions as well as your air line so you get the most accurate braking experience with an air brake-style truck.
Continue Researching
- Search Results: pintle hitch
- Search Results: trailer hitch
- Shop: Brake Controller
- Q&A: Towing a Trailer with Electric Brakes with a Semi Tractor with Air Brakes
- Q&A: Is There a Pintle Adapter for the Flash Solid Steel HD Adjustable 2-Ball Mount
- Q&A: Hayes Air Actuated Brake Controller or Tekonsha Prodigy P3 for Peterbilt Truck with Air Brakes
- Shop: Deka Jacketed 2 Wire, 10 Gauge, Brake Wire - per Foot
- Shop: Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way Flat - 10 Gauge Wires
- Shop: Brophy Adjustable Pintle Hook Mounting Plate for 2" Hitches - 7" Drop - 10K
- Shop: B&W Pintle Hook Mounting Plate for 2" Hitches - 13" Shank - 14 Hole - 16,000 lbs
- Shop: Brophy Adjustable Pintle Hook Mounting Plate for 2" Hitches - 5" Drop - 10K
- Shop: Buyers Combination Pintle Hook with 2" Ball - 2-1/2" Hitches - 20,000 lbs
- Shop: Curt Pintle Hook - Bolt On - 20,000 lbs
- Article: Trailer Wiring Diagrams
- Article: Wiring Trailer Lights with a 7-Way Plug (It's Easier Than You Think)
- Shop: Vehicle Tow Bar Wiring
- Video: Pollak Trailer Connector Adapter Review
- Video: Complete Breakdown of the Roadmaster Brite-Lite Wiring Converter
- Video: Set up: Roadmaster Front Anti-Sway Bar on a 2015 Coachmen Mirada Motorhome
- Search Results: trailer wiring
- Search Results: air to electric trailer brake controller
- Search Results: accessories and parts
- Q&A: Can Electric Brake Controller Be Installed on Semi with Air Brakes
- Q&A: Adapting 7-Way Round Pin on Mack Semi-Tractor to 7-Way Blade Style RV Connector
- Q&A: Trailer Wiring Solution for Semi Truck to Connect to RV with 7-Way Blade Connector
- Q&A: Recommended Brake Controller and Wiring for a Semi Trailer
Heather A.
12/22/2025
Hey Keith, how did the setup with the ETBC7 kit and Hayes brake controller work out on your semi? Your update could make it easier for others trying to run electric trailer brakes from an air brake system.