Thanks for the response, This belt cycles back and forth about 60 times a minute. I've also done some more research since I posted. While I liked all the suggestions, My thinking is also as NJwirenut and JBD suggested, the single shot timing relay. Most machines of this type are set up similar to what NJwirenut described with 2 photocells facing each other. I guess this manufacturer decided to cut corners [Linked Image]