Alright, I have to revive this thread with some questions.
So I was looking into why the horns weren't working, but then I remembered the cruise control on the truck doesn't work either.
Another forum post told me that on the models with cruise control, the horns and cruise control shared a relay, otherwise there was no relay for the horns.
Which leads me to the question - has the horn/CC relay gone bad?
If so, where is said relay located?
And would this be the cause of the fuse blowing immediately?
Thanks!