1973 Duster Dome light wiring route

Does anyone know where the wires go from the dome light? I found that the Map light switch was disconnected and cannot find the wire in the dash, so I wanted to find it after it goes from the light down the side of the car and to the dash. I would have thought it would run to the drivers side down to the floor and then up to the dash via under the sill plate where the other bundle of wires were. Any help?