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I have searched and found some similar issues but let me throw a curve into this
03 F250SDCC 7.3
I was preparing a small utility trailer to hook up to my Truck. There was no physical connection between the two. No light wires, chains nothing. As I placed the trailer onto the ball my horn began to blow continuously. I was able to unhook both negative cables to stop it. Reconnected one negative cable, and still have continuous horn. Not having a lot of time I merely pulled the horn fuse.
In the other posts I read it could be relay, horn switch, control module, clock spring or even the air bag assembly.
Obviously my situation is only different by when it happened. Any help will be appreciated.