Any ideas why my headlights don't work? 1976 Dart Sport.

If your car is not listed get the closest you can find, like if you have a 74 a 73 while not exactly correct will be very close.
X
Nope! Not close. The main circuits are very different.

Your next task is to find out why you do not have power to the switch.

Do the rest of your accessories work? Brake lights? Radio? Wipers? Heater?
and you have to understand the '76 power feeds.
https://www.forabodiesonly.com/mopa...electrical-connections.555552/post-1974573601