I have a customer that wants me to add a zone to their backyard. This is one of my first jobs as a licensed irrigator. I can not locate the valve boxes in the backyard where the new zone is to be installed. I purchased a Station Master Pro 24 this week and hoped I could use the chatter mode to locate the valves. Since I have never used the SM before I may be doing something wrong or maybe I misunderstood what the chatter mode is. I attached the clips to the common and the red wire for the valve I wanted to locate. After putting the SM in solenoid Activate mode I moved the switch to chatter. I expected to be able to walk to the area I suspect the valve should be and listen for the valve to chatter. I did not hear anything. I then did the same procedure with a valve that I knew the location of and again heard nothing, even with the valve cover off and standing right over it. Am I doing something wrong? Did I misunderstand what the chatter mode is? Thanks for the help. The valves are Hunter and the controller is Toro.