I needed a good explanation of how a headlamp switch worked in my 1979 D200 and didn't feel like a solid resource existed explaining how it got power. Here's what I pieced together:
H - This goes to the floor switch
D - door switches, dome light
I - Goes to the fuse block for instrument lamps (all those orange wires behind the dash)
R - Rear lamps and parking lights (some internet resources said this only powers tail lamps, but the wiring schematic...
Headlamp Switch Diagram
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