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Why does an incandescent bulb go bad when the switch is turned on rather than after its been on for awhile?
Wiki User
∙ 12y ago
It doesn't always ... sometimes bulbs do burn out after being on for a while ... but the sudden surge of voltage when current is suddenly applied is a very common time for the filament to break.
Wiki User
∙ 12y ago
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Why do headlights stay on in 1997 ford explorer?
you could have a broken or damaged switch for your head lights, or if they stay on for awhile after you turn off the switch, then you have daylight sensors and they should turn off automatcly Make sure the switch on the rear view mirror is turned off.
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