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Had the same problem with mine. With it sitting in the garage, with the key out, the interior lights would repeatedly cycle on and off. It eventually got to the point where it would drain the battery. I took it to the dealer (it was still under warranty), and they replaced the module that controlled the interior lights. They told me that if it had been out of warranty that it would have cost around $400.00.

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15y ago
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Q: 2000 grand marquis interior light come on after the car is off?
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