Map Light: 70 Duster

My 70 Duster came with the Light Package. The Map Light seems to be working opposite of the way it should. With the Map Light switch ON, the light turns on and off with the dome light. This happens when you open the door or turn the head lights switch all the way to the left. Both lights work together, either on or off. If I turn the Map Light switch OFF (when the two lights are on) the map light goes off but the dome light stays on. If I turn the Map Light switch back ON, the map light comes back on (but only if the dome light is on). If the dome light is OFF, I cannot turn the map light on with the Map Light switch. This seems backwards to me, I should be able to turn the map light on by itself, without the dome light being on.
What's wrong and how do I fix it?
Thanks

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