If I can snake it, wire from the vent to the control panel porch light input might be a good source. If the fan caused flicker, it would be an outside rather than an inside light. By tapping the input side, the switch wouldn't affect fan operation either. I see my LR vent fan as short term operation as it is a noisy, high volume, single speed and would be used for sucking out hot air upon campsite arrival.
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2015 Ford F-350 XLT Ruby Red 6.7L Powerstroke, 4x4, Short Bed, Andersen Ultimate Hitch
Cougar High Country 299RKS, Mor/Ryde pin box, 200w solar
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