Helping a widow with a small problem with lawn irrigation, now becoming a big problem! Installed a few years ago by her deceased husband, is an Irritrol controller, and 6 valves, (all Rainbird). Valve 1 would not come on in the cycle. Other valves function OK. At controller, Valve #1 reads 4.6 volts when activated. My guess was the solenoid, replaced it. No change!! Read that interior of valve body may be worn, Replaced it! No Change! Ran the contoller thru full cycle of valves, only Valve #1 failed to open. Noticed that the Valve #1 at contoller has a yellow wire, but at valve- color is dull - brownish . Could this be a weathered "Yellow" or should I suspect a splice that is not holding, since it gets afternoon sun.
What am I missing? Any suggestions would be most helpful