1.The Combination Switch:
Turns signals, Bright lights (AND signaling with "Brights"),and Wiper/Wash functions.
IS SEPARATE from
2.The switch that controls the Electric motor that moves the
Steering Wheel Fore and Aft.
3.Headlights could be:Headlights Switch(Unlikely that it's the Ignition Switch...But),Fuses,Relays,Wiring,Bulbs.

Time to break out the DMM and start Spelunking.

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'84 300SD sold
124.128