one of your wire n the steering column is grounding to the body when its not supposed to.... for now, check your underhood and underdash fuse boxes and look for the horn fuse and hopefully you have one. just take it off temporary until you have time to resolve the issue.
after you took the fuse out, start the car and check all your lights. if lights or any important accesory aare off, you could put the fuse back on.