How did you go with the horn, I just repaired mine. A tiny thing stopped it working; The issue was the contacts were ok, drawing the plunger in however, it wasn't pulling it down enough. Inhadnto make a thin cardboard washers to go over the plunger to allow it to draw open the contact. Too thick and it didn't work, too thin.. not enough. Some pics to help.. I can only post one pic..