On my '73 914, the headlights will pop up but the bulbs do not light. Neither does the side marker lights. I have checked the fuses and they seem fine.
Is there a relay somewhere that supplies 12V to the headlights? Any suggestions?

Did they work, then just quit? Try flipping the stalk switch.I've seen either the high or low beams go out, and the other work. Usually a problem with the switch.

There is a relay for the high beam / low beam switching. Does everything else, electrical, work fine?

Pull the headlight relay and test the lights there by jumping the white or the yellow if they come on it's probably the switch