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Well to describe the early description of how it works. There is a wire that runs up the steering that is connected to the button. That connects when pressed to the grounded column. The lighting is separate.
If you have had a 41/42-46 car and you get shocked when pressing the horn and having your elbow on the open window. you could concluded the live wire is shorting.
Be creative and make it happen. I'm not sure there is someone that has done it before. You might be the first. The concept is simple though.