Okay. I'm a dope. I've owned the car for 25 years and never had a dome light. Didn't want to destroy the old light cover that was on the car. Finally found a replacement cover (I'm slow and it wasn't a priority). Old cover disintegrated on removed (expected), but got a brand new base and light cover installed. Fresh light bulb.
I don't know how to turn on the dome light. Opening the door doesn't do it. Turning the headlight knob doesn't do it (how I adjust the brightness of the dash lights).
Am I missing something obvious?