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How do I identify the Dome Light polarity? I am working on an overhead Directed DVD and the instructions tell me to determine this. I assume it is so that the light turns on when the door opens instead of when it closes...
 

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Polarity means which wire is positive and which is negative. If you have a meter and/or a test light, you can test to see which wire is powered and which one is not. If you wire it backwards, it won't work and may burn up your DVD player.
 

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There are 3 wires to the dome light (oranage, black, and grey)

The orange is always hot (+) and the black is ground (-). The grey is only hot when the door is open. I am installing a DVD too (Pyle PLRD92).

I will do a write up of the install maybe Wed or Thurs.
 
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