I want to wire in a Heated seat for my 2008 Ultra Classic using the accessory rocker switch on dash board for on/off power. I looked at a wiring diagram for an existing wire leading under the seat and as far as I could determine there isn't one. Right now nothing is operated by the switch as far as I know. It is a factory installed stock switch. I did a search and for other years there is either a 3 or a 4 wire plug near the battery for other years. Is that the reason no heated seat is listed for the 2008?