[QUOTE=mitchgo;450792However. I did learn the other day that with a nicked wire and the zone showing 600k ohms I could still locate the valve with the positive on the zone wire and ground on the common.[/QUOTE]
So? Don't brag about anything unless you tell us what device was used to measure the ohms and the other to find the valve. Hard to believe 600k ohms, but my old trusty Fluke 77 with auto ranging may have adjusted for it.