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Why do the headlights stay on the only way to turn them off is by pulling the fuse what could be the problem?
Sweetpeanik
You don't mention the make, model, and year of your vehicle so this answer will have to be generic in nature.
Many of the later model vehicles are designed for the headlights to remain on for some time allowing a person to have light to navigate their driveway, sidewalk or garage to an entrance door to the house.
This condition of headlights remaining on temporarily is accomplished using a "relay" which is a switch which is controlled by an electrical current.
That relay control current is usually provided by an electronic timer device. Sometimes the timer is inside the relay, and sometimes it is a separate device, possibly located some distance from the relay.
Therefore, IF the timer "sticks" in the on mode, or the contact points in the relay stick in the closed position, then the electrical current to the headlights never gets turned off and thus the headlights stay on.
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