[Daner]

I had a car do that to me this summer on the way to a parade. Horn ring was broken and I couldn't get it to honk. Start driving to town and the horns would just turn on and off at random. Pulled into the lot where you line up with horns blaring. Before the parade I just tore a bunch of wires off a junction block so it wouldn't go off since both horns were behind the grill and in front of the radiator where i couldn't get to them.

Sorry I don't have a solution for you but I had to share my random horn story.