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I don't think there is enough power running to the interior lights to light the 12V bulb. I could be wrong though. I know the headlights and taillights use 12V but it seems like the interior lights wouldn't need that much. You could wire them into your parking lights and then they would only be on when its dark enough to make a difference.

EDIT- Now that I think about it, everything in the car should operate at 12V since they all use the same power source. I guess this is when paying attention in physics class would help. Dizamn