What Kind of Relays Does the Curt T-Connector Vehicle Wiring Harness # C56012 Use?
Updated 10/27/2025 | Published 03/18/2025
Question:
What kind of relays do the C56012 use
asked by: William H
Expert Reply:
Hello William,
The Curt # C56012 trailer wiring harness uses standard automotive relays, specifically the common Bosch-style 5-pin relays you’ll find in many 12V applications. These are single pole, double throw (SPDT) relays, typically rated for 30 to 40 amps. Inside the harness, they’re used to safely power the trailer’s lighting circuits without putting extra load on your vehicle’s electrical system. If you ever need to replace one, you can look for a 12V SPDT relay with a 30/40 amp rating and a standard Bosch-style footprint. Some common replacements include Curt’s own # RE113, Bosch’s # 0-332-209-150, or Omron’s G8HN-1C4T-R-DC12.
Were you needing a replacement relay? I attached some images from the instructions about the relays.
(click to enlarge)
(click to enlarge)
Product Page this Question was Asked From
Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
- Custom Fit Vehicle Wiring
- Trailer Hitch Wiring
- Vehicle End Connector
- No Converter
- No Tow Package
- 4 Flat
- Plug and Lead
- Plug-In
- Hidden
- CURT
more information >
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Kate F.
10/27/2025
Hey William, did the Bosch-style 5-pin relay end up working for your Curt wiring harness? Knowing how it performed could help others needing a similar replacement. Your update could make it easier for the next person with the same issue.