Recommended Wireless Brake Controller and Wiring for a 2021 Subaru Crosstrek
Updated 01/06/2025 | Published 01/03/2025
Products Featured in This Question
Question:
Hi. I have a Subaru Crosstrek Touring 2021 with 4 pin trailer wiring. If I use the ETBC7, 4 to 7 way adaptor and want to use the Curt wireless brake controller can I do this and where would the blue and black wires on the adaptor connect to as their will be no brake controller inside the vehicle. Many thx Graham
asked by: Graham C
Expert Reply:
Graham, yes you can absolutely use the Curt Echo Wireless Brake Controller # C51180 with your 2021 Subaru Crosstrek. Since you only have a 4-pole though, you are also going to need to add the 7-Way RV Upgrade Kit for Trailer Brake Controller Installation # ETBC7L.
This is the preferred kit over the adapter # 337TC1474P because it includes the ring terminals, breaker, zip ties, and screws for install. I've also attached a quick picture that shows you what wires to hook up and where they go.
(click to enlarge)
Product Page this Question was Asked From
Buyers Products Trailer Connector Adapter - 4-Way to 7-Way RV and 4-Way Flat
- Custom Fit Vehicle Wiring
- Wiring Adapters
- Universal Fit
- 4 Flat to 4 Flat
- 4 Flat to 7 Blade
- Plug and Lead
- Buyers Products
more information >
Continue Researching
- Shop: Trailer Wiring
- Q&A: Parts Needed to Add Brake Controller to 2026 Ford Transit T350
- Search Results: 337tc1474p
- Search Results: etbc7
- Shop: Curt Venturer NEXT Trailer Brake Controller w/ Plug-In Harness - Up to 3 Axles - Time Delayed
- Shop: Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
- Search Results: 4 pin to 7 pin conversion
- Search Results: ford 7 pin harness
- Search Results: 7 pin
- Search Results: 4~way
- Shop: Brake Controller
- Q&A: Recommended Wiring Harness and How to Install on a 2024 Ford Transit T350
- Shop: Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way Flat - 10 Gauge Wires
- Video: Review of CURT Custom Fit Vehicle Wiring - Trailer Hitch Wiring - C42MJ
- Search Results: brake kit
- Video: Install: Universal Installation Kit for Trailer Brake Controller on a 2018 Ford Transit T250
- Shop: etrailer Electric Trailer Brakes - Self-Adjusting - 10" - Left/Right Hand Assemblies - 3.5K
- Shop: Buyers Products Trailer Connector Adapter - 4-Way to 7-Way RV and 4-Way Flat
- Shop: 7-Way RV Upgrade Kit for Trailer Brake Controller Installation - 12 Gauge Wires
- Shop: Redarc Tow-Pro Liberty Brake Controller w/ Universal Wiring Harness - Dash Knob - Proportional
- Article: How to Install an RV Awning From Scratch
- Q&A: Parts Needed to Add Brakes to 3,500 lb Trailer Axle
- Q&A: Adding Electric Brakes To 2,200lb Dexter Torsion Axles
- Q&A: Adding Brakes to Dexter Trailer Axle
- Q&A: 7-Way Mounting Bracket for Use with ETBC7L and Curt Echo Mobile Brake Controller
- Article: Wiring Trailer Lights with a 7-Way Plug (It's Easier Than You Think)
- Video: In-Depth Review of the Universal Installation Kit for Trailer Brake Controller
- Video: Curt T-Connector Vehicle Wiring Harness Installation - 2016 Ford Transit T350
- Video: etrailer Trailer Brake Controller 7-Way RV Upgrade Kit Installation - 2020 Subaru Outback Wagon
- Shop: Transmission Cooler
Graham
1/6/2025
Thanks Bryce but if I am using a wireless brake controller where would the blue wire on the etbc7 kit connect to as it will not need to route into the inside of the vehicle. Thx Graham