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.