Adding a 7-Way Trailer Connector to a 2017 Toyota Highlander Limited Platinum with 4-Way
Updated 03/16/2018 | Published 03/15/2018
Products Featured in This Question
Question:
I already have the factory hitch and harness in place but would like to convert it to a 7 pole round connector. I will be pulling a T@B tear trailer without electric brakes. Which wires do I need to connect and which ones can I leave unattached? Do I still need any circuit breakers? Thanks for the help and information.
asked by: John R
Expert Reply:
To add a 7-Way connector to your 2017 Toyota Highlander which already has a 4-Way installed you will just need a few parts. First for the 7-Way you can use # 37185. This will add the 7-Way and retain the 4-Way should you need it.
If your trailer does not require 12 volt power then the only wire you will need to connect, other than the 4-Way, is the white ground wire which will go to a clean, bare metal surface.
If the trailer does need 12 volt power then in addition to the 37185 you will also need about 20 to 25 feet of 12 gauge wire # 12-1-1, sold by the foot, and circuit breaker # PK54540. You will also need some ring terminals and wiring tools so if you do not have those items I recommend kit # HM51020. Ground the white wire as explained above and then you will use the 12-1-1 wire to attach to the black wire on 37185. Route the wire to the vehicle battery. You will need any leftover wire to go from the breaker to the positive battery terminal.
Attach a ring terminal to the end of the wire and secure it to the AUX post on the breaker. Using the leftover wire attach a ring terminal to one end and secure it to the BATT post on the breaker. The other end will then go to the positive battery terminal using another ring terminal.
I have included some links that will help. Please note that not all of the instructions in the links will apply to your installation.
Product Page this Question was Asked From
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 >
Featured Help Information
Instructions
Miscellaneous Media
Continue Researching
- Shop: Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way Flat - 10 Gauge Wires
- Q&A: How to Determine if a 2017 Toyota Highlander has a Factory Tow Package
- Q&A: 7-Way Wiring Harness for a 2017 Toyota Highlander
- Video: Best 2017 Toyota Highlander Trailer Wiring Options
- Shop: T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
- Shop: Curt Trailer Hitch Receiver - Custom Fit - Class III - 2"
- Q&A: What is the Difference Between a Class II and a Class III Hitch?
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Search Results: trailer hitch
- Shop: Curt Powered Tail Light Converter with 4-Pole Flat Trailer Connector
- Video: Feature Breakdown: Universal Installation Kit for Trailer Brake Controller
- Shop: etrailer Trailer Hitch Receiver - Custom Fit - Matte Black Finish - Class III - 2"
- Search Results: trailer wiring
- Article: Trailer Wiring Diagrams
- Q&A: What is the Difference Between a 4-Way and 7-Way Trailer Connector
- Video: Curt T-Connector Vehicle Wiring Harness Review C56040
- Shop: Brake Controller
- Article: How to Choose the Right Trailer Hitch Class
- Q&A: What Is An OEM Prep Package And How Do I Know If I Have It
- Search Results: brake controller
- Video: In-Depth Review of the Universal Installation Kit for Trailer Brake Controller
- Shop: Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
- Search Results: trailer hitch ball mount
- Article: How to Measure for Trailer Hitch Drop
- Q&A: Difference Between Curt and etrailer Trailer Hitch Receivers for 2020 Chevy Colorado
- Video: Curt Powered Tail Light Converter Installation - 2023 Kia Telluride
- Shop: Suspension Enhancement
- Article: My Trailer Hitch Doesn't Fit
- Search Results: hitch
- Article: Wiring Trailer Lights with a 7-Way Plug (It's Easier Than You Think)
on Accessories and Parts
