battery drain electrical problem

[duke10]

After not being able to remove my upside down steering wheel,I had my mechanic pull my steering wheel off and turn it right side up, after he did this I was gettin a weird buzz from the horn cap area. I do not have a horn on this truck.
I only drive this truck on Fridays and weekends and last Friday after it had sat all week I jumped in the rig to head to work and had a completely dead battery, no lights, no trying to turn over, no nothing. I replaced the battery and she fired right up. I drove the truck all weekend and this Friday after sitting all week dead battery again. Is it possible there is a horn wire that could be live that would account for the weird noise and the battery drain? I don't know anything about the electrical system. Anyone have any ideas? Thanks, Scott.