Trailer Wiring and Brak Controller Recommendation for a Semi Truck
Updated 12/22/2025 | Published 10/05/2024
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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.
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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.