Hi.Refer to the Atlas wiring diagram here:
https://www.accessnorton.com/NortonCommando/early-norton-wiring-diagrams.20232/
IMO, you should connect R (dipper switch) to UR (wiring diagram) and W (dipper switch) to UW (wiring diagram.
Slick
Usually R is ground and W is fire.
Why all the wiring fiagram go from U to UR and UW without the dipper switch wires?.
Piero