Okay…I believe I have it all figured out.
None of the heater/defroster, cigar lighter, or dome lights show up on any wiring diagrams that I can find.
But, I did find a light 1937 light switch diagram that labeled the cigar lighter and dome lights, so I was able to confirm those.
As for the heater and defroster, I think it makes sense that they connect in after the ignition switch.
Here are some simplified diagrams. The diagram for the light switch is one that really helps visualize each switch position.
Attach file:
IMG_8017.jpeg (201.77 KB) IMG_8018.jpeg (192.04 KB)
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