I was also wondering about installing a Current Keeper.  However, the motherboard (Bachmann H682X-PCB01) that I have does not have the connector for it.  I have installed these in various locomotives in the past but this one has me a bit confused.  I can use a SoundTraxx JST-NEXT-18 Connector to replace the motherboard and connect the Current Keeper to it, but I would really like to retain the original Bachmann motherboard if possible.  I contacted SoundTraxx and they said that Bachmann makes this board and actually did not know, which really surprised me.  Their advice was to contact Bachmann.  Anyone have any advice (other than have a professional do it....LOL)