why did you bother about the 14 pins ? - if you still have the 5 pin connector you only need to worry about the 5 pins ;-)
i've found the pinout on [http://www.insanelymac.com/forum/index.php?s=&showtopic=47788&view=findpost&p=1478919|insanelymac]:
Grey: +12V
Grey: +12V
Black: ground
Black: ground
Brown: PFW (battery powered signal between +3 and +6.5 volt to switch power supply on)