Re: 1936 Horn problem
You are correct. The horns sound because the wire feeding them has been grounded.
An auxiliary switch would be open until grounded when the button is pressed. Originally I don't think there was a fuse in that line.
Have you considered rehabbing the original? On our '36 it was a matter of crud in the switch part of the horn rod. Cleaning it up and making it shiny with emery cloth did the trick. It's a couple of hour job, and you want to be VERY CAREFUL when withdrawing the rod so that you do not bend it in the least.
Good luck, write if you want more details on cleaning up the original switch.
Henry
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