I just purchased a real traffic light, and it is already wired to be plugged directly into a 120V outlet. What I am looking for is a relay of some kind that will allow the three lights to flash randomly. I went to Radio Shack, and they had relays, but none of them seemed to be what I am looking for. Does anyone know if there is such a think as an inline relay? Basically, something that I can cut a wire, put a relay in, and it will work? Any help is appreciated!!!