I doubt that the wiring was there from the factory , many aren't pre wired.
Do you have a ceiling light close by that works from a switch on the light , instead of a wall switch?
The power draw of the fan is low , so fishing new wire over to the vent from the light is the first option.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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