Mazda Repair: 2001 B3000 truck Horn quit working, truck horn, test light

Question
My horn won't honk. It just stopped. Every thing else is fine. Could this be a fuse or relay? Any advice on where to start my trouble shooting? Thanks for your time and your advice.

Answer
first thing is check the horn fuse,  it should be listed what number it is in your owners manual. if thats ok, put a test light to the horn termial while someone tries to push the horn,if it lights then your horn is bad, you can test a relay by pushing the horn and you should hear some kinda click noise under the dash. most of the time it is the horn itself that goes bad