Hopefully you can wire this with the resistor assembly loose just to test the operation of motor before installing the resistor way back behind. I don’t know if you have the original harness and it’s connectors that plug into the switch or the resistor. I don’t know if your wires will follow the colors on the wiring diagram I have. The colors are not critical, just how it’s wired, but I will give the colors on the diagram.
Starting at bottom contact of fan switch:
1. A wire from the fuse panel from a 10A fuse goes to bottom contact on fan switch. This is the hot feed. (BRN)
2. A wire from next fan switch contact goes to an outside contact on the resistor. (YEL)
3. A wire from next fan switch contact goes to center contact on resistor. (BLU)
4. A wire from next fan switch contact goes to the other outside contact on resistor. (ORN), then a wire from this resistor contact goes to fan motor (ORN)
There is a lamp on the 4 lever heater control assembly, it’s wire is connected in with the other panel lamps. (GRY)
The fan switch up, is off, then low, med, hi. If it does not operate like that, reverse the outside wires on the resistor assy. The diagram I have does not show which outside contact is which.
To clarify:
The "outside" contacts are vertical and the center contact is horizontal on the resistor assy.
Please let me know if it works. No hurry.
