69 273 headlights wont turn on

Looks like it is largely un touched which is a good starting point.

When you get your wiring diagram start studying it. These cars are relatively simple. The black box with the red sticker on it to the right of your master cylinder is the voltage regulator. In a nut shell battery voltage goes in one end and a different voltage comes out the other end. From there it goes to your aternator, to control the field strength to regulate the charging to the battery.

Many things could interior this and cause the alternator to stop charging.

By the way I am sure there are members in your area that if you bought them a beer would come over and help you work through some of the issues. If I still lived in OC I would be there in a heart beat, but I'm in Colorado now and it is a bit too far