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What Gauge is the Black Wire of the Curt 4-Way to 7-Way C57672  

Published 04/30/2025

Question:

What gauge is the black 12V power wire in this adapter?

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Expert Reply:

Hey Kevin, the 12 volt accessory circuit of the 4-way to 7-way part # C57672 that you referenced is 12 gauge. What do you plan to power with this circuit?

expert reply by:
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Jameson C
Kevin profile picture

Kevin

4/30/2025

I would like to be able to charge a travel trailer battery. My plan was to run 10ga wire with a 30amp in-line breaker from the car battery to the 7-pin connector. Would I need to re-wire the adapter with a 10ga wire?

Jameson C. profile picture
Etrailer Expert

Jameson C.

4/30/2025

@Kevin Great question but not necessarily. You'd want to run the rest of the wires as 10 gauge for the longer runs since longer wires mean more resistance but just this short section being 10 gauge wouldn't be a problem. Now if you wanted amperage to the battery then yes you would want to rewire it.

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