How are you checking for power?If my NSS isn’t seeing any power, how are my turn signals, wipers, etc working?
If I'm understanding the diagram correctly, you should be seeing ~12V on the black/white wire only with the ignition in the 'start' position.
You should see ~12V on the black wire with the ignition in the 'on' or 'start' positions.
The fuse block is powered by several wires: