Try using a voltmeter or test light and go the #3 solenoid. Operate each zone one at a time and check when you get current to #3 at the same time another zone is properly activated.
I've thought about 'crossed wires'... but I can't think of any scenario where the
zone #3 control wire would come into contact with ever other control wire in
Actually you are probably on the right track there. At this point, I would not discount anything until I rule it out. It depends on how the whole circuit was wired. Some systems run all the wires from the control box to another gang box in the yard. All the wires from the solenoids run to that box as well as all the wires from the controller. Then they match them up in the box. Sort of like the song, "You start walking my way and I'll start walking yours" and they meet in the middle.
Actually, I'm kind of curious- why 14 zones? That seems like an awful lot unless you have a really BIG yard.
Probably not a stuck valve. Usually they won't come on at all or won't shut off at all if that's the problem.
If it's worth doing, it's worth doing right. If you wouldn't put your name on it, it ain't done right!