I need help replacing old Rain Bird with Rachio 3 . wiring is kina giving me a headache 
not sure about these cables … ORN and GND (probably Ground)
Never mind. I just matched the numbers between both controllers and ignore all the extra wires… It’s working like a charm. Apparently we don’t need Ground wires in Rachio 3
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@manibaig - correct. Those wires look like they were going to the power supply which is a plug on the Rachio.
Enjoy and welcome to the community.