Bench Testing '64 Impala SS horns

as 67dart273 said, get a normal car battery and a larger wire, as horns need a lot of juice to make them work properly. As far as the corrosion inside, I have had to tap some to get them going again... BUT, think about it, if they aren't working properly, and you have to mess with them, replace them! Horns are something that when you need them, you want them to work. Kind of like a smoke detector, you don''t use it a lot but, when you need it, you want it to work!