72 dome, map light questions

BE CAREFUL

The "traditional" yellows were the switched ground circuit of the dome lamps, but in that diagram, the seat belt and IGN sw lamps yellows are "hot."

I'm not sure I ever figured that all out, partially because the map switch nor the special door switch used on one side are diagrammed. You might want to "ohm" those two out

I've suspected that the map switch is switched to ground, IE the switch itself must be mounted and grounded