2003 Silverado trailer wiring question

One pin on my 7 pin trailer wiring connector is not working. It is the aux power that stays hot all time. I assume there is a fuse blown somewhere but dont know where this fuse is. Can anyone help?

Thanks!

Hey, there should be a fuse in the panel under the hood that is for the aux. power on your plug.

Hey, there should be a fuse in the panel under the hood that is for the aux. power on your plug.

I'm almost ashamed to admit this but I did not know these trucks (mines a 99) had separate fuses for the trailer plugs. I could only get one light to work on mine & finally gave up & took it to a trailer shop where the first thing the kid asked me was "did you check your fuses"? I told him all my truck lights worked so why would I need to check them? "Your trailer fuses" he said.
DOH!!!