7-Way Recommendation for Install of Brake Controller in 2023 Subaru Ascent

Updated 08/07/2025 | Published 07/09/2025

Question:

I am going to be towing a pop up camper, which requires a 7 pin connect electric brakes with my wife’s Subaru ascent 4 pin connection. Obviously I will be adding brake controller however, my question is this: Will a 4 to 7 pin connection provide everything necessary to provide power to the trailer brakes or do I have to wire in a 7 pin connection? If the latter wiring in a 7pin connection do you have recommendations or sell a kit or product which will do this with relative ease? Thanks in advance, Repeat Happy Customer Chris

asked by: Chris S

Expert Reply:

Hey Chris, so a standard 4-way to 7-way adapter like the part # 37185 only has the taillight circuits active. To install a brake controllre you'd need an adapter like the part # ETBC7 which comes with the same 4-way to 7-way adapter but also with the wiring needed to wire in a brake controller. For a brake controller the P3 part # 90195 is a really great choice if you are looking for a recommendation for that as well?

expert reply by: Jameson C

Jameson C.

8/7/2025

Hey Chris, how did the installation of the brake controller go with the ETBC7 kit? I'm curious to know if it made the process easier for you, as I'm always looking to help others in similar situations.