As a part of my fix list, I decided to tackle the horn early on. It should be simple, and I'm not sure why I didn't think of this when I first realized it was broken.
The fuse.
I was looking through a few forums on the Suburban, and people mentioned that the horn could short out, have loose wires, water that grounds things, or have a blown fuse. With a blown fuse, they definitely recommend that you consider water if it blows again.
I walked outside, pulled the hood up and then the fuse box and hunted around. The horn has a relay and fuse, both of which are hard to get out. There's a fuse puller in the box, and I used that to pull it out.
Blown.
That's an easy fix. I didn't have any 15A ones around, but I got some a few days later and replaced the fuse. The horn worked, and that's one item off my list.
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