Thanks for the tip, it proved helpful. Yes they are the same 2 zones always (7 and 10). When I disconnect 7 they both go on when 10 is on and when I disconnect 10, they both go on when 7 is on. I haven't done any digging recently, but I did notice some chipmonk holes (I hate those darn things) very near one of the valve boxes. Have you ever heard of them chewing the wiring?