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Reply to "Insulated rail signal works properly when track power is not applied."

My last thought still has to do with powering the track and the DZ1075. The ground of the track power output of the Z4000 must go to the outer rail of your layout, and the ground of the accessory output of the Z4000 must go to the ground of the DZ1075 (DZ1075's black wire).

If, as I suspect, the track outer rail and the DZ1075 are not connected to the Z4000 black terminals, the reason why it works with track power full off is that I believe the Z4000 grounds the its red track output with full off throttle - necessary for correct proto operation.

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