I had an old 1993 RainBird system with 12 zones. The system has a custom 24 pin connector, and then a "breakout" connector for a freeze/rain sensor. I've managed to figure out most of the zones, but can't figure out where the common and master are. I know my system has several pumps, but I don't know where they are (I can hear them--they're VERY LOUD.)
Is there an easy way to determine what's what with the wires? I've cut the wires behind the connector and shoved them in the unit where I thought they'd go. The unit will not water, however.