I have a 2004 F150. I went to use the horn and it would not work, I kept depressing the center of the steering wheel and it finally honked. But now the horn will not work at all. I checked the fuse and the fuse is good, I even replaced it just in case but it still is not functioning. Any Ideas of what could be the problem? There is supposed to be a relay but I can not locate it to be able to check it. I am half tempted to run a wire directly from the battery and see if the horm modules work or not.

Any information that anyone can provide me with is greatly appreciated.

 

Looks like you already diagnosed it, sounds like the switch to me.

 

Check the ground at the horn. Sounds like it could be the switch but give the easy things a try first.