One of my original horns wasn’t working so I took it apart and adjusted the contacts as outlined in the manual. Now it works but the contacts get very hot and start to smoke. I took apart a later horn, not sure which model it came out of, and found that the coil was burned to a crisp. It had an electrical component in series with the coil. It shows in one of the pictures. Does anyone know what this component does? Perhaps to keep the contacts from burning out?