We have been tracing wires for last couple days. Are these valves supposed to ping when the solenoids are bad? Found 7(all with bad solenoids), but had to do alot of pokin' because the things just will not sounds off. Once the new solenoids are installed they sound off, but I do got a loud reading when I go over a valve with bad solenoid. And I know we have been over them several times with the wand. Tried zone wires, then common. No difference. Also, we using a Greenlee 521 with fresh batteries. Is this what yall do, just trace wires and bring a damn pokin' rod when the solenoids are bad? or am I missing a trick?