I recently discovered that the (capped) 12V connection in the right arm rest of the 3rd row is threaded but not "live". Can anyone tell me where or how to connect this or what to do to get juice from this socket?

If you pull the socket out of the armrest (if it's a nuovo Ulysee, post 2002) there should be a connector just waiting to be plugged into the cigar lighter socket.

hi, when i got my car, i also noticed this, all i did was check the fuse, it had blown, changed it and it worked.
bit simple, but this worked for me.