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Depends on the vehicle. On some, the fog lights are independent of the headlight switch, and the circuit may remain hot (up to the switch) regardless of whether or not the headlights are on.

This is more common in instances where the fog lights were wired in as a DIY aftermarket project, and are often run straight off the battery or an unused slot in the fuse panel.

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Q: Is the fog light fuse supposed to draw power if the truck and light switch are both off?
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