Which Fuse Provides 12-Volts to 7-Way Connector on 2009 Chevy Silverado 3500 Diesel

Updated 02/29/2020 | Published 03/10/2015

Question:

Which fuse control the 12v power on the 7 way plug on a 2009 3500hd Chevy diesel

asked by: Tony

Helpful Expert Reply:

If the 12-volt pin on your trailer connector isn't working, you've got a missing or blown fuse or the wiring connection at the fuse box under the hood wasn't finalized.

You're looking for a 40 amp fuse, located in position # 68 in the fuse box under the hood. The fuse protects one of the nearby power studs on the side of the fuse box, which is where the wire that provides power to the 7-way should be connected. If it's not, you can find the wire bundled up under the master cylinder (see photo). Simply uncoil the wire and attach it to the right hand stud on the fuse box.

expert reply by: Mike L

click to enlarge

Jim W.

2/28/2020

I have a 2008 gmc 2500hd diesel..my 7 way charge wire is dead..the wires under hood on the front of the fuse box are hot..all other circuits are working..will I have to run a new wire?

Chris R.

2/29/2020

If all your fuses are good (you can check your owner's manual for the 12V trailer charge fuse location) and wire connections under the hood are made then your best option would be just to run a new hot lead. This allows you to bypass the factory wiring which can be frustrating to troubleshoot and likely expensive to repair. Just run some 10 gauge wiring through a breaker from the positive post of the Sierra's battery to the 12V pin on the 7-Way and it'll be good as new.

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