I use this and i just jack my scala rider into it. I keep this in my jacket pocket and run a wire down the inside of it to a female connector that comes out of the bottom of the seat. I set it up in the parking lot of frys yesterday lol so i have to redo it to hide the wires under the gas tank and stuff but works good.
http://www.amazon.com/Boostaroo-Port.../dp/B000219896