is it not activating when tested manually from the clock like, a manual all stations or test,or is it when it is set up to run automatically from the clock. its somthing elctrical obv,but what lol. need more info kinda. what kind of clock is it,cant tell you much without knowing what your looking at ,it could be so many things from cut wires,bad common splice,mice got into box,bad fuse in clock,rain sensor faulty,many many things.