Looking to upgrade some electrical options and wanted to use a switched power supply to power up a USB port on my 05' GS , found this port right behind the seat and looks like I may not have the mated adaptor to use this connection ? Only have a Haynes manual and could not find out much about this 4 pin connector, measured voltage from 1 pin that was neg to others showed 10v on one and 12V to other 2 when key turned on ? All 3 points increased to +2v when bike running....can anyone point me to the correct schematic or explain ?