I have an old family farm 1967 Loadstar 1800 that I use to haul my 1975 CJ-5 around. The headlight switch is bad. The wiring is perfectly fine (you can jump the connector wires to turn on the lights, ...
Few things are more intimidating than sudden darkness on an isolated stretch of road. If you've been driving a classic Mustang for any time at all, you've probably lost your headlights at least once.