MB Doc just did.
Go to the fusebox, with the lights turned on, see if you have power to the fuses. If no power then it's either the combination switch (combo) or the rotary switch (headlight switch).
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.