Your best bet is probably going to be to try to run a fish tape from the opening, through the roof, and over to the area behind the microwave. If you have cabinets with lights next to or close to the microwave, that's where the 12V wires are going to be.
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2011 Outback 277RL
2013 F250 XLT Crew Cab 6.2L
Bitter Gun Owner
Bitter Clinger
Armed Infidel
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