It seems like mine needs to be replaced about every 3 weeks. My mechanic says tat they are a flimsy POS. I think that International planned it that way all along. As heard at the Navistar International offices: "Perkins, Get In Here!" "What boss?" "How can you sell UPS all those trucks at twenty dollars each?" "It's simple. We practically give them the trucks to get their business. And then we're gonna make a killing on all the horn buttons we're gonna sell them!".