I dropped the vent trim first thing. There is wiring for the lights, but of course no power until you turn on the lights. I actually tried creating a channel in the styrofoam from an adjacent vent opening to the cupboard above the entry door. That's where the usb plugs are, and a 12v power supply. No joy yet with that idea. It SHOULDN'T be this HARD! Dang! This is a very popular addition to our coaches.
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