Can't tell you if yours is pre-wired or not, but if not you could do what I did once to get power there.
I put a FF in where no power was present, but there was a light nearby. I took the old vent out, and took the light out. I drilled a hole through the side of the roof framing, inserted a piece of electricians fish tape through to the light, then spliced in power and ground wires to the light wiring and pulled it over to the vent opening.
It was very easy to do.
2007 GMC 3500 dually ext. cab 4X4 LBZ Dmax/Allison - 2007 Pacific Coachworks Tango 306RLSS
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