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ORIGINAL: firstonthebadlist

Interior lights are tough, they are generally a large circuit running all over the car. They usually work backwards, they are fed b+ power at all times and grounded to make them work. Somewhere you have a high  resistance ground, that's why the lights are on dim. Putting a screw partialy through the wire or pulling the wire against a sharp edge and partially grounding is probably what is wrong. Have the problem present and watch the lights as you move the wiring. If you move the bad wire you will see a change in the light, gets brighter or dimmer depending if you made the problem better or worse. I hope this helps you out.