Everything works but the headlights.

I have a 68 Dart, slant six, automatic that I am rebuilding. When I look at the wiring under the dash and in the engine compartment, I cannot believe this car is 45 years old. The wiring looks really good. Anyway, I got a new battery, all new bulbs, etc. and everything is working perfectly except the headlights. I just got a test light today and will check the power to the lights when I get home, but just wondering if anybody knows some weird tid-bit about this problem. I have an excellent wiring diagram of the whole car and checked everything associated with the headlights. Thanks in advance... John