Dart Headlight Trouble

Hi guys-
We just took the old '69 out for a little shakedown cruise. There's no plates on the car yet, :D so we stayed in our neighboorhood. Car runs like a CLOCK now!
Anyway, as it got darker, I flipped on the headlights. They came on nice and bright and stayed that way for about 15-20 minutes. Then they shut off. We still have parking lights front & rear, brake, plate, dash lights and they're all nice and bright. I wiggled the headlight switch a little but it didn't help. There isn't a fuse for the headlights so I figured the headlight switch just gave up. Is there anything else I can check before I replace the switch? Is there a way to test the switch before I replace it?

Thanks in advance guys.

Author: admin