How Do I add 7-Way Trailer Functions to my Vehicle that has a 4-Way Trailer Harness?

Updated 06/11/2026 | Published 06/10/2026

Products Featured in This Question

7-Way RV Upgrade Kit for Trailer Brake Controller Installation - 12 Gauge Wires

(405)

$78.87

Question:

Hi there. I have a 2025 Toyota Grand Highlander Platinum Max. I am purchasing a Jayco Jay Flight camper that has brakes on it. I have the Toyota factory tow bar and 4-pin wiring harness on my car. I also have a Curt Echo Controller. Would the ETBC7L kit be the appropriate on to install so I can run my trailer brakes through my Curt controller? Thank you for the help.

asked by: Pat F

Expert Reply:

You are spot on Pat, Nice work!

Yes, the etrailer 7-Way RV Upgrade Kit # ETBC7L would be the correct kit for your setup. Since your Grand Highlander already has a 4 pin connector and you’re using the Curt Echo brake controller, the ETBC7L will add the 7-way connector and the 12-volt power the Echo needs to run the trailer brakes.

Once you get this all installed, Do you have any camping plans for the summer?

expert reply by: James D

Leland

6/11/2026

This 7 way upgrade kit is just what you need. It is built a lot better than most other 7 way kits on the market. Installation is simple and the product is very durable. I like ours very much.

James D.

6/11/2026

@Leland Thank you, this kind of feedback really helps. Glad to know we are able to deliver a reliable product. We appreciate you choosing etrailer!

Leland

6/11/2026

@JamesD Everything I have bought from Etrailer has been top of the line products. Thank you very much for being a Great Company.

James D.

6/11/2026

@Leland thank you for the kind words. We aim to provide the best experience, so feedback like this let's us know we are doing the right things. We appreciate you choosing etrailer!

Steven

6/11/2026

I use the exact same system on my 2024 Grand Highlander. I pull a 16 foot enclosed trailer with trailer brakes. Check out the photos in my review to see how I was able to tuck the mounting bracket slightly higher. Overall, it works just fine.