My cars dome light won't turn off?!?

1999 Taurus. I have the dome light in the DOOR position. All the doors (as well as the trunk and hood) are completely closed and locked. However, the dome light still won't turn off. I now have it in the OFF position so the battery doesn't die, but how do I fix this??
Update: Haha nope!!! The thumbwheel that adjusts the brightness of the gauges was turned all the way up and thats what makes the dome light stay on no matter what, even if all the doors are closed. It's all fixed now! Thanks
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