I have a 05 f150 my horn was working fine one day the next started cutting out and getting high pitched then a few days later went out completely now every time i honk my horn or turn my alarm on there is no sound but i can hear a clicking noise that comes from the fuse box. i have checked the horn fuse its fine. sounds like its coming from the back of the fuse box. What is it does anyone know???

 

Relay?!!

 

When horns go out, they will blow a fuse... I bet your horns are garbage...