Hmmm, that doesnt help too much yet. Not sure where that plug you are talking about is... under the carpet? or you mean the plug near the door sills and the drivers door switch?
As far as mounting, I found these little dome shaped green LED lights at radio shack, and I though I would kind of just hide them up under the foot well areas and maybe just zip tie them to something under there. I dont want to see them, just the light they cast.
I have four of them. Wanted to do two per side... I would just wire them all in to the R-W wire and just cast a green glow down there.
But unless I figure out where to hook them in to do the dome switch control I will just have to put them on a manual switch, or I suppose I could figure out how to connect them to the door switch - 2 on each side at least. I know where those come out and they are easy to get to running along the door sills. Pass. side would turn on pass side lights and driver side switch would illuminate the drivers side lights.
They kind of look like this but not near this big:
