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
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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.
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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
- 10 Gauge
- 12 Gauge
- Deka
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on Wiring
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.