Horn doesn't work on Isuzu Rodeo 97

My wife and I just bought a 97 Isuzu Rodeo to replace our old Ford Escort which finally died. (and spectacularly so.)

We’re pretty happy with the Rodeo so far even though the gas mileage isn’t quite what we’d like. However, the horn doesn’t work. I’m guessing it’s probably just the fuse or it’s been disconnected. I can’t get a hold of a chilton manual for the 97 anywhere that’s in my price range. (I’m looking for work right now so the budget is super low for that kind of thing. It’ll be one of the first things I buy when I’m working.)

Does anyone know where I can get a decent fuse diagram etc so I can figure out if it is the fuse or an electrical or connection issue?

Worse comes, I’ll get the mechanic to check it out when we take it in for an oil change.