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By connecting to the wires together you created a short circuit, that is why they "frazzled". The "current" didn't flow through anything, in this case the horn.
Not knowing the layout of your vehicle or steering wheel but normally one wire would be earthed the other would supply the horn. As long as the horn itself is earthed as well,the bracket for the horn itsel is usually metal and this bolts straight on to a metal part of the car.
Currently in SportTourer's garage:
2010 Laguna III SportTourer Initiale Tom Tom.