The three in the Kymco plugbare easy, 12v, ground and data. The data is some kind of format that is present in the OBDII pin out. What it is, I would have to google it again. Gimme a minute and maybe I can find it again....
Your a star, I will look into doing this soon.
I also remember there being two plugs next to the battery, one being the obvious diagnostic plug and one right next to it., think it was a 2 pin.
Do you have any idea on the pins for kymco plug, I know I can use a multimeter, but it's always nice to know.