I looked into doing this awhile back too. My plan was to drill and mount a single LED bulb in the bottom of the RVMirror housing, but never nailed down weather to draw power from the vehicle or just stash some AA batteries inside the housing (base mirror). As much as I would like the power to be integrated with the vehicle, it was tough to find a 12V bulb in the color and/or brightness that I wanted, plus the CAN/BUS system didn't lend itself easily to power tapping. Batteries would have to be changed periodically, but you would save yourself a wiring mess to go this route.
This location does work perfect for what you're looking for, though. I experimented with several bulbs (blue, white, UV, etc) and all would work depending on what look you want. Gave a nice faint glow to the center stack, shifter area, cupholders, and the mirror cast a shadow line right at the console lid. There's just enough room inside the mirror housing for an LED or two, some wires, a switch/button, and batteries if you need. Just don't bust out your windshield putting the mirror back in!
Last edited by Kansas1230; 05-14-2010 at 01:10 AM.