Map light from hell!

Hi guys. Anyone out there have the same problem with their 74 Dusters? Both 1974 Dusters that I've owned have had the same weird map light problem. When you're inside the car, the map light switch doesn't turn the map light on. So you test the map light by opening the door, and it illuminates just like its supposed to. So now with the door open, you pull the map light switch to the rear (the on position). Now the map light turns off. The bulb and receptacle are good, it's just that something...

Map light from hell!
Author: Cruiser