Where is the fuse for the accessory power for the trailer plug on a 2004 Chevy Silverado?

I tried hooking up an RV that needed the 12V accessory power from the trailer light plug on the back of my truck. I used a volt meter to see if there was 12V and there wasn’t. The wire is there, so I’m guessing the fuse must be blown. I checked both fuse boxes, but I couldn’t tell which one it was. Does anyone know what its called or at least what amperage it should be? I really don’t want to check every fuse. Its an 04′ Silverado with the Duramax and 4×4 if that matters.
I’m nottalking about the brake wire. Its working. I’m talking about the 12V constant power wire. On a 7 Blade plug its the top right contact. It is supposed to deliver a constant 12 volts to power electric jacks and charge batteries for RV’s. Nothing to do with the brakes. the wire is hooked up there just is no power. I don’t want to run a wire if there already is one there.

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2 Responses to Where is the fuse for the accessory power for the trailer plug on a 2004 Chevy Silverado?

  1. me June 28, 2010 at 12:03 am #

    that 12 volt is in the center of your plug for the brakes on your rv. It has to run through a brake box that is mounted under the dash at your right knee. If you do not have one there you will need to put on in the plug should be in the glove box you will have to plug in into the plug under the dash above the gas pedal. Then wire it up to the trailer box and the mount it on the dash at your right knee.

  2. casey November 23, 2011 at 4:23 am #

    It’s in the fuse box under the hood. It’s one of the MAXI fuses, and there should be a red square blank in its place. Stud #1 on the diagram. It should take a 40.