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There is a light sensor somewhere up front, probably on the dash. After about a minute of darkness, or when it's dark when you power up, the lights go on. Similarly, after about a minute of lHopight, they go off. I've thought about (but haven't done it yet) covering the sensor on my Jeep Grand Cherokee to have them on all the time. Hope that helps.

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โˆ™ 2006-05-23 00:47:05
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Q: How do Automatic Car Headlights work electrically and how do they know when to turn on?
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