Dome light electrical problem

[bigd65]

Ok I have a problem. My DOME LIGHT, it comes on when I close the door and goes off when I open the door. The dome light under the dash works correctly. Here is another problem. If I turn the the headlight switch all the way to turn the dome light ON, the dome light goes off and comes back on when Ai turn it back as if I were dimming the dash light

This is the damdest thing I have ever seen, I just don't understand it.
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