Does 12 Volt Accessory Circuit of Trailer 7-Way Wiring Have Fuse Protection

Updated 01/04/2026 | Published 05/26/2020

Question:

does the back 12v wire to the trailer have a fuse?

asked by: Robert W

Expert Reply:

Yes there will be a fuse that protects the 12 volt trailer accessory circuit of your 7-way wiring. If this is factory wiring of a truck you'll want to check out the fuse box diagram or the owners manual.

expert reply by: Jameson C

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Reginald

5/14/2025

Where would the 12 volt fuse be located

Jameson C.

5/14/2025

@Reginald Depends on the vehicle but in the fuse box there should be a fuse/circuit labeled 12 volt accessory.

Don

8/26/2025

Hi Jameson, What is or would be a typical fuse size supporting a trailer hitch 7-pin electrical plug? Thanks!

Jameson C.

8/26/2025

@Don Depends on the circuit as they all have different requirements and are all separate. Are you referring to the 12 volt accessory circuit?

Donald D.

1/3/2026

I've already changed my fuse in my truck but my passenger turn signal and running lights for my RV not working what else is it

Jameson C.

1/4/2026

@DonaldD Have you checked the pins of your connector for corrosion and tried cleaning them?

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