First if all, I never owned a TIU so this may pertain to both.
On my grandson's layout there are two separate loops with a common ground and the ability to isolate one from the other. There are four wires coming from the control system(s).
2 hots, one common, and one auxiliary
For the Lionel interface the setup works fine. The MTH setup is not electrically connected to it in any way. The interface for the Lionel control is disconnected and the MTH connected to the layout in it's place when required.
Using a Z-1000 brick, using the AUX with the common works fine for AUX purposes. My question is with the MAIN output barrel jack.
Can I use the main output of the brick to Fixed 1 IN and then attach both the track one hot and the track two hot to the Fixed 1 OUT Hot? In other words split the FIXED 1 OUT between two loops that are switched back and form with toggle switches between one double loop and two independent loops?
Thanks,
John