I wasn't running horns for a while, but I do know the wiring for them was working. I did this wiring conversion a year ago http://www.1957-chevrolet-alternator-conversion.com/conversion.html due to my wiring harness getting ripped out, and seems to work... I found some original horns and to my surprise they weren't working after being wired to the car. (Yes the horns work!) From the link I posted, there was some horn relay wiring going on, don't know if that's the reason? Anyone have a clue? I did the wiring exactly as described in the link.