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Your headlights dim because when you press the window switch the charge in your battery is now being used up by more things. Mostly your car should not do this while running because the alternator in your car is giving the battery a constant charge. You might want to check your battery or the alternator. Most auto parts stores can check your alternator for free if you take it off and bring it to them.
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Earn +20 ptsQ: How come headligths dim down when pressing window button?
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