Best Way To Add RV 7-Way Connector To Semi Truck
Updated 01/27/2026 | Published 12/30/2025
Products Featured in This Question
Question:
Hi there. Working on a custom project adding pintle and ball hitch on a semi truck. Looking to buy your 7- and 4-Pole Trailer Connector kit but also need wiring for them. Can you help me with wiring for both? Cant find for some reason. A link would be very helpful. Thank you
asked by: Mike B
Expert Reply:
Hello Mike, thanks for reaching out. The best way to add a 7-way to a semi is by adding a whole separate RV 7-way in addition to the current semi 7-way. To do this you'll need a converter # 119250KIT. Then to install the actual RV 7-way use install kit # ETBC7 which will also include everything to install a brake controller. For a brake controller you can use any standard controller like the Tekonsha Prodigy P2 # 90885. You'll likely need additional wire # 16-4B-1 for 16 gauge which can be used on all tail light wires. The # ETBC7 kit I mentioned comes with 25' of wire. Take a look at the diagram I included. Let me know if there is anything else I can do to help!
(click to enlarge)
Continue Researching
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Article: Trailer Wiring Diagrams
- Article: Wiring Trailer Lights with a 7-Way Plug (It's Easier Than You Think)
- Q&A: What is the Difference Between a 4-Way and 7-Way Trailer Connector
- Article: How to Choose the Right Trailer Hitch Class
- Article: Brake Controller Installation: Starting from Scratch
- Q&A: What is the Difference Between a Class II and a Class III Hitch?
- Q&A: My Vehicle has a 4-Pin Trailer Plug, but Trailer has 7-Pin Trailer Plug
- Article: How to Measure for Trailer Hitch Drop
- Q&A: 2025 Kia Sportage PHEV
- Article: Wiring Trailer Lights with a 4-Way Plug (It's Easier Than You Think)
- Q&A: What is the Difference Between the Tekonsha Prodigy P2 and the P3 Brake Controllers
- Q&A: Availability of Victron DC/DC Battery Charger With Lithium Compatibility and Engine On Detection
- Q&A: 7-Way and 4-Way Trailer Wiring Combination for 2015 Ram ProMaster 1500
Jesse M.
1/27/2026
Hey Mike, how did your wiring setup go on the semi with the converter and ETBC7 kit? Your results could really help others working on a similar custom project.