Dome light issue - 66 Barracuda

I agree with 65 dartman on his advice. However since the footwell light is being turned on the door switch is likely OK. Recently had this come up on a clunker I revived and that was that the overhead domelight requires a two pin bulb (officially a #1004). In this instance someone had put in a single pin bulb which did not make contact so worth checking. Once kick panel is off you can disconnect overhead domelight plug and test for 12V on pink wire on main harness side and or make a jumper to send 12V thru overhead dome light harness to see if it reaches the dome light above. The yellow wire is a ground and you should not connect it directly to a 12V power source. If overhead domelight harness is disconnected from main harness you can then jump it like the pink wire to see if the 12V's makes it up to the overhead dome light fixture as a wiring check. Also consider cleaning bulb contacts and/or removing overhead domelight to clean socket contacts.