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No cars brake lights will work when the car is off, it's a simple fact of the way that cars are wired. Why would they wire something that isn't needed when the car is not running, to work while the car is off, all that would do is leave a failure point, I.E. what if somehow the brake light got stuck on, instead of turning off with the car, it stays on and the battery goes dead while you are in work.

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Q: Why do Brake lights not work when key off on 2001 mercury cougar?
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