Did you check the fuse for the horn ? Engine compartment fuse panel, fuse #7, 20A
You can pull the horn relay, and jumper the normally open contacts to see if the fuse, horn and grounds for the horn are in working order ( this operates the horn without needing to use the horn button ).
The Horn relay is a half size Ford ISO relay in the engine compartment fuse panel ( check your owners manual to locate relay 206 ).
Diagram to jumper the horn relay, with this in place, the horn should sound as long as the jumper is in place
If you did not get an owners manual with your truck ( purchased used ), you can download one from Ford :
https://www.fleet.ford.com/maintenance/owners_manuals/default.asp
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