Converting a Semi 7-Way Trailer Connector to an RV 7-Way Trailer Connector
Products Featured in This Question
Question:
i am trying to convert my semi 7 way to an rv 7 way trlr
asked by: Shawn
Expert Reply:
There are a number of factors involved when converting a semi 7-way to an RV 7-way. Semis generally use a 7-pin round pin socket, similar to # PK11720. And RV style 7-way uses blades, like # PK12706. We do not offer any pre-made adapters to make this conversion that will carry all of the electrical functions required by the RV.
Another thing to be aware of is fifth wheel trailers use a combined wiring system where the brake lights and turn signals are on circuit. Your semi connector uses a separate wiring system where the brake and turns are on different circuits.
Also the brakes on your trailer are likely electric brakes and your semi 7-way is not wired to power them. The brakes on a semi are typically air brakes, and are controlled through a different connector than the 7-way. You will need to install an electric brake controller in the cab of your truck wired to the RV style 7-way to power your brakes.
If you want to keep your existing connector on your truck you can splice into the wiring. Or if you have no use for it you can cut it off completely.
To combine the tail light circuits of the semi you'll need a converter # 119250KIT. To install the actual RV 7-way use install kit # ETBC7 which will also include everything to install the brake controller. For a brake controller you can use 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.
Attached you'll find a help article on trailer wiring as well as a diagram showing how an RV 7-way connector is wired.
Product Page this Question was Asked From
Hopkins Endurance Quick-Install 7-Way Trailer Connector with Universal Pigtail Harness - Vehicle End
- Trailer Wiring
- Trailer Connectors
- Vehicle End Connector
- Plug and Lead
- 7 Round - Blade
- Hopkins
more information >
Featured Help Information
Instructions
Miscellaneous Media
Continue Researching
- Q&A: How to Make an Adapter to Go from Semi Truck 7-Way Round to RV Style 7-Way Blade on Trailer
- Shop: Trailer Wiring
- Shop: Roadmaster Brite-Lite 3-to-2 Tail Light Converter for Towed Vehicles
- Shop: ZCI Circuit Protected Vehicle Wiring Harness w/ 4-Pole Flat Trailer Connector and Installation Kit
- Shop: Brake Controller
- Shop: Suspension Enhancement
- Shop: Curt Cold Weather 7-Way RV Style Connector - Trailer End - 10' Long - RV Standard
- Shop: Hopkins Trailer Connector Adapter - 7-Pole Round Pin to 7-Pole RV
- Shop: Firestone Ride-Rite Red Label Extreme Duty Air Helper Springs - Rear Axle
- Shop: Pollak Black Plastic, 7-Pole, RV Blade-Style Trailer Socket - Vehicle End
- Shop: Pollak HD, 7-Pole Round Pin Connector w/Cable Guard
- Article: Trailer Wiring Diagrams
- Q&A: Converting From 7-Way Round to 7-Way Flat Connector
- Search Results: dexter brake actuator
- Video: Mount: Air Lift LoadLifter 7500 XL Ultimate Air Helper Springs on a 2020 Ram 2500
- Search Results: 5th wheel gooseneck adapter
- Q&A: Difference Between 7-Way Wiring Diagram that Uses Red Wire and Purple Wire
- Article: Wiring Trailer Lights with a 7-Way Plug (It's Easier Than You Think)
- Video: Pollak Trailer Connector Adapter Review
- Video: All You Need to Know About the Power Watchdog Surge Protector with Bluetooth
- Video: Checking Out the Gooseneck to 5th Wheel Trailer Coupler Adapter
- Article: Brake Controller Installation: Starting from Scratch
- Video: Hands-On with the Hopkins Trailer Connector Adapter
- Search Results: tekonsha 90195 p3
- Video: Complete Breakdown of the Roadmaster Brite-Lite Wiring Converter
- Search Results: tail light converter flat tow wiring harness
- Q&A: Difference Between Solid and Split Round Pin 7-Way Connectors
- Article: Gooseneck to 5th Wheel Adapters
- Q&A: Connecting Semi Tractor Truck Wiring to 5th Wheel RV Wiring
- Q&A: Semi Trailer Light Function Locations on Heavy Duty 7-Way Pin Connection
on Trailer Wiring
