How To Connect 4-Way Flat Vehicle Connector To 7-Way on Trailer
Question:
I have a 4-flat on my vehicle. I want to connect to 7-round on my trailer. Do you have a cable or a coiled-cable for this? Thanks in advance!
asked by: Bill H
Expert Reply:
To connect your vehicle that has a 4-Way flat connector to your trailer that has a 7-Way connector, you will need to install a 7-Way on the rear of your vehicle. If you just want or need the tail light functions to operate on your trailer you will just need Adapter 4 Pole to 7 Pole, part # 37185. If you need the complete 7-Way wiring to operate, you will need Brake Controller 7 & 4 Way Installation Kit, part # ETBC7.
The 4-Way on part # ETBC7 will plug into the 4-Way on your vehicle and then you will need to connect the remaining wires. The White wire is the ground and should be connected to the frame of vehicle. The Black wire will be connected to the Black wire inside the duplex cable and ran to front of vehicle and connected to the battery via included 40 amp circuit breaker. The Blue wire will be connected to the White wire inside the duplex cable, and ran to the front of the vehicle and later will be connected to the brake controller. The Purple wire can be connected to the reverse lights if trailer has reverse lights or can be taped off and tied out of the way if not being used.
Installing a 7-Way on your vehicle will allow you to install a brake controller on your vehicle to activate the brakes on the trailer if equipped or for future towing needs. Part # ETBC7, will allow you to have both a 4-Way and 7-Way on the back of your vehicle.
If you need a brake controller, email me back and I would be happy to recommend one. Also if you need a brake controller, let me know the year, make and model of your vehicle as some vehicles use a plug-in harness to install brake controller.
I have linked an FAQ on wiring and on installing part # ETBC7 that you may find as a good reference.
Products Referenced in This Question
Adapter 4-Pole to 7-Pole and 4-Pole
- Trailer Wiring
- Wiring Adapters
- Multi-Function Adapter
- 4 Flat
- Plug and Lead
- 4 Flat
- 7 Round - Blade
- Hopkins
more information >
Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way Flat - 10 Gauge Wires
- Accessories and Parts
- Trailer Brake Controller
- Installation Kits
- etrailer
more information >
Product Page this Question was Asked From
RoadMaster 6-Wire Flexo-Coil Kit
- Flat Tow Wiring Harness
- Plugs into Vehicle Wiring
- Extension Cord
- Universal
- Roadmaster
more information >
Featured Help Information
Instructions
Miscellaneous Media
Continue Researching
- Shop: Trailer Wiring
- Shop: Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way Flat - 10 Gauge Wires
- Shop: Adapter 4-Pole to 7-Pole and 4-Pole
- Shop: Trailer Hitch
- Q&A: My Vehicle has a 4-Pin Trailer Plug, but Trailer has 7-Pin Trailer Plug
- Article: Trailer Wiring Diagrams
- Shop: Brake Controller
- Video: Install: T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector on a 2023 Toyota Highlander
- Shop: Curt Echo Wireless Brake Controller - 7-Way Plug-in w/ Bluetooth App - Up to 2 Axles - Proportional
- Q&A: Can a 4-Pole Trailer Connector Be Used to Activate Trailer Brakes
- Search Results: c56217
- Search Results: 23518
- Video: Mount: EcoHitch Hidden Trailer Hitch Receiver on a 2023 Toyota Highlander
- Video: Review of Tekonsha Custom Fit Vehicle Wiring - Trailer Hitch Wiring - TK57VR
- Video: Installation: T-One Vehicle Wiring Harness for Factory Tow Package on a 2021 Toyota Highlander
- Video: Checking Out the 2" Hitch Ball
- Video: Best Hitch Lock Options
- Article: Wiring Trailer Lights with a 7-Way Plug (It's Easier Than You Think)
- Shop: T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
- Shop: 2" Hitch Ball - 1" Diameter x 2-1/8" Long Shank - Chrome - 7,500 lbs
- Shop: Curt Powered Tail Light Converter with 4-Pole Flat Trailer Connector
- Shop: Redarc Tow-Pro Liberty Brake Controller w/ Universal Wiring Harness - Dash Knob - Proportional
- Video: Setting up the Universal Installation Kit for Trailer Brake Controller on a 2019 Toyota Highlander
- Search Results: bx2411
- Shop: Base Plate for Tow Bar
- Q&A: How Close Does Trailer Ball Height Need to be to the Height of the Trailer Coupler
- Q&A: Recommended Hitch for a 2023 Toyota Highlander Hybrid Limited w/ Full Size 20 Inch Spare Tire
- Q&A: 2022 Toyota Highlander Wiring for a 7-Way Blade Connector
- Q&A: Comparing Hidden Crosstube Trailer Hitch Receivers For 2021 Subaru Outback Wagon
- Article: Trailer Jacks
on Flat Tow Wiring Harness
