Well, first thing is be sure your dash switch is working. I experienced a short that blew out my indicator lights and the rheostat. I had to move a couple spades around to restore light function. If your clearance lights function it is probably not the switch.

When the floor dipper died in the 68 sedan I lost my headlights entirely.
This seems to be the normal failure mode. You can also lose them when you dip from high to low and then they never come back on. It gets very unpredictable.

When I lost my switch, I still had running/clearance lights and (fortunately) spotlights on the yankee bar with a separate switch and circuit so I used those to get to work and back in the dark of winter.

I chose the opportunity to "restore" the dipper control to the turn signal stalk.
It is a simple upgrade (with the instructions)

The only catch is that you need a proper relay - which can be pricey if you don't have a spare handy.