Rich -
From you photo on the first post it looks like you are using DZ-1000 motors. I am not sure if you will ever want to add non-derail, a signal lamp to indicate turnout position or something else that would require a relay like the DZ-1008 to be connected to your turnouts so below gives you the capability to do all.
The switch motor has three wires - power and two 'ground' (the yellow and green wires). For a simple connection the red wire goes back to the power terminal on your transformer. The ground from the transformer is connected to a whatever control mechanism you are using (Ross supplied or after market like a DPDT mom toggle switch). For the Ross controller (again three wires) connect the black wire to transformer ground. For the DPDT toggle switch connect the ground wire from the transformer to the center post of the toggle switch. Connect the yellow/green wires from the switch motor to the yellow/green wires from the Ross controller or to the outside posts of the toggle switch. You should be good to go.
If you want the pair of 072 turnouts to operate in tandem simply connect the yellow/green wires together then go to the controller/toggle switch.
You have no choice with the turnout yellow/green wires. Each must feed back to the control board. However you can use a common ground wire for all controllers/toggle switches. I don't know for the Ross controllers (someone else may have a good idea like a bus wire system) but for the toggle switches bring one wire from the transformer to the center post of the first toggle switch then connect a wire from that post to the next center post on the next toggle switch etc, etc.
With respect to the power wire (red) you can bring one heavy wire from the transformer to a central terminal and connect from there to each turnout motor. You may need more than one terminal so just connect terminal to terminal with some heavy wire.
In my case I have non-derail and DZ-1011R detectors (electrical tape over the sensor) connected to the turnout motors through a DZ-1008 relay. This means more wires under the switch machine plus a terminal for ground. I use European style terminal connectors. I have four 6-position terminals (the 12 position are easy to cut in half). One each for power, ground, yellow and green wires. I make all my connections for the switch motor, relay, DZ-1011R and non-derail to these terminals.
I may be wrong but I believe for non-derail to work track ground and turnout switch motor ground must be common to each other (ie connected together). I have a common ground on my layout and it works. I don't know if the function will work for separate ground systems.
Joe
