Recommended Circuit Breakers and Wiring to Install the 4-Way to 7-Way Curt Trailer Connector Adapter
Updated 10/27/2025 | Published 03/07/2025
Products Featured in This Question
Question:
I am using the Curt 57672 to connect my Saris Door County bike rack. What breaker or fuse will I need to install? Thanks
asked by: Galen G
Expert Reply:
Hey Galen! You can use the Wiring Kit item # 5506 to install the Curt Trailer Connector Adapter item # C57672. This kit includes duplex wiring for both the charge line and for adding a brake controller. The kit includes a 20-Amp item # PK54220, 30-Amp item # PK54230 and 40-Amp item # 9510 circuit breaker.
The 20-amp breaker is used to power the brake controller for single and tandem axle trailers. The 30-amp is used to power the brake controller for use on a trailer with braking axles. The 40-amp is used for the 12v line.
If all you're wanting to do is power the 7-way, you can use item # 10-1-1 and the 40 amp circuit breaker item # 9510. Additionally, you will need three of the ring terminals item # DW05705-1.
(click to enlarge)
Product Page this Question was Asked From
Ring Terminal - 12-10 Gauge Wire - 3/8" Ring ID
- Wiring
- Wire Connectors
- Ring Terminals
- 3/8 Inch Diameter
- 12-10 Gauge
- Deka
more information >
Continue Researching
- Article: Flat Towing Package for 2012-2014 Honda CR-V
- Q&A: Comparing the Roadmaster Direct-Connect and Crossbar-Style Base Plate Kits
- Article: Flat Towing Package for 2016-2018 Ford Focus
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Q&A: How to Avoid Battery Drain While Flat Towing a 2013 Honda CR-V
- Q&A: Difference Between Crossbar Style Baseplate and Direct Connect Baseplate Towing 2019 Ford F-150
- Q&A: Difference Between Roadmaster Crossbar-Style and Direct Connect Base Plate for 2018 Subaru Forester
- Q&A: Parts Needed to Flat Tow a 2013 Honda CR-V AWD Behind a Motorhome
- Q&A: How To Install The Roadmaster Universal Brake Monitoring System In A 2013 Honda CR-V
- Q&A: Recommended Way to Keep Battery of 2013 Honda CR-V Charged While Flat Towed
- Article: Wiring Trailer Lights with a 6-Way Plug (It's Easier Than You Think)
- Article: Breakaway Kit Installation for Single and Dual Brake Axle Trailers
- Article: Using a Portable Generator on RV
- Article: Wiring Trailer Lights with a 7-Way Plug (It's Easier Than You Think)
Jerred H.
10/27/2025
Hey Galen, how did things go using the 40-amp breaker and ring terminals to power your 7-way for the Saris Door County rack? Knowing what setup worked best could help others wiring the same adapter.