Yep, I was lucky the factory had the wiring ready for the fan. In my case, as soon as I removed the trim (shroud) from the inside of the RV, the wiring was immediately visible. So anyone considering a fan to replace a vent can remove the shroud first to see if it's already wired. Just 4 screws is usually all that's holding the shroud in place so it's easy to find out.
BTW, I was surprised to see how thick the roof cavity is (for the air conditioning channels) and the nice aluminum framing around the vent openings.
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