Confused on wiring. 1964 Barracuda.

Gotcha, so turning on the courtesy/dome lights basically turns off the dash lights. I guess I will need them powered due to the seat belt requirements. From what I can tell looking at the diagram, the door switches appear to be unfused coming straight off the battery connector on the hot side of the fuse box. First thing it goes through is the map light before the door switch. Is it using the bulbs for fuses? It'd basically blow the bulb before melting the wires?