Mystery wire(s) help

you must mean the map light switch is by your left knee - isn't the light itself all the way over under the glove box??? It is supposed to be there for the passenger to see the map! Anyway on my 70 Darts there is an accessory light package harness. In the service manual the accessory harnesses are on a separate diagram. Usually the cigar lighter connection is a right angle plug that fits over a threaded post on the back of the lighter. The accessory harness has a similar plug, like the one in your picture, and there is a side wire that has a threaded post for the cigar lighter right angle connector so that both run off the same power source. I can't easily get to my harness under the dash (AC) or I'd take a picture