Wiring diagrahm for a 1969 barracuda convertible?

Sounds like the map light switch wires. Tied together the map light would operate from the door switch only. The brown was internally grounded by the switch and goes to one side of the map lamp bulb, which manually turned on the map light. The yellow grounds through the door switch. By tying them together the switch was eliminated. Break the connection and see if the map lamp under the dash quits working when you open the door.