Just did this mod today on my wife's car. I switched the wires in the connectors going to the map lights, which wasn't as bad as I thought (didn't take too long). Got everything put together, put the 20A fuse back in, then opened the door. Dome light came on, but no map light. "WTF" I thought to myself. Then I remembered reading on here that if they don't work, to switch around the LED festoon bulbs I had in there. Bang - it worked! Switching those wires must reverse something. My wife will love it. Thanks for everyone offering help, especially those who posted pics (I'm a visual learner).