Also depending on how much the voltage has decayed, if these are the main supply, look for higher voltage is you replace them with solid state. If they supply Gen Fields car could run quite a bit faster. Be careful, safe, and prepared. check car speed. If its for doors, door speed will change with solid state. New units are solid state with supressors to protect inverse voltage from relay inductive kicks and coils.I think Adams sells a replacement made with supressors.