@Pisano772 - Curious. Did you test the Orbit installation to see that it actually worked?
Yes, normally the white wire is the common wire.
Can you find a valve cover and visually inspect the wires going into a solenoid in the yard? If so, one wire should terminate and be the color for the zone and the other wire will be the common wire (and unless it is the last solenoid on the wire, this wire will continue on to the next solenoid).
Or, do you have access to a volt/ohm meter?