Problems with Door switches and Headlight switch

No, the D terminal "is" the switching wire to the dome circuit, and when you twist the knob, it should GROUND that terminal through the headlight switch. I believe "some years" of switches actually had a separate ground tab "to make sure."

See the yellow wire goes throughout the car to all the door switches and to the light switch D terminal. Anytime you ground the yellow, it activates the dome light.