When we got our 2016 Minnie Winnie 27Q I also wanted to change out the crank open roof vents for fan vents but found there was no 12v wiring to the cutout. There was an overhead light about 2 feet to the left so I used a 5/16 aluminum rod to carefully punch a hole through the Styrofoam from the vent cutout to the cavity for the light fixture. It took a little time to make sure I didn't punch through the ceiling and ensure I was on course to that cavity, but it worked. I snaked the wires between the two fixtures, wired it up, and it worked fine.
Then I went to the back to do the same for the vent over the bed. The nearest light was about 2 feet forward from the vent hole but the rod hit a pretty solid obstacle in the Styrofoam about halfway to the light. I figured this was probably a roof crossmember of some kind and I didn't want to risk doing any irrepairable damage by trying to drill through it, so I used a piece of 1/2 inch surface mount Wiremold from Home Depot to stick on the ceiling surface between the two fixtures, wired them up and the fan works great. The color of the exposed 24" of Wiremold is close enough to the ceiling that we don't notice it at all.
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2016 Minnie Winnie 27Q on a 2015 Ford E450 chassis. Retired U.S. Air Force. Lived in Anchorage, Alaska for 30+ years. Now Living in Deming, NM.
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