Can anyone explain how a horn system works and how it is to be wired. When I first got the 71 Nova the horn did not work. I replaced the horn and the horn relay and it worked. Not exactly great but it worked. When you pushed the horn button the horn would blow but was kind of muffled. If you touch a hot wire to the horn it blows clear and loud. Well now the horn doesn't blow at all. Questions. Does the horn button act as a ground or is it hot? What does a horn relay do? how do I test the system to find out what the problem is?. By the way the horn relay is located near the power break and not by the radiator as 71's should be. Does the horn relay have to be grounded? right now it just floats in mid air with the wiring holding it in place. Real shoddy!