Nick - I'm only using ONE, two-cell A123 pack that I made from the DeWalt 36v pack. I installed TWO 22ga male connectors from + and -, and ONE "three wire" male with the orange wire on the center tap between cells. This male mounts to the fuse side in an Ernst housing, and I have the output connector from my Cell Pro wired so that the "node" wire is the orange wire. It works just dandy (thanks to Dick for working with me to come up with this solution). This configuration permits the on-board three wire switches to work normally. I just don't charge through the switch anymore.

To power the ignition regulator, I'll use a "y" off of one of the switch battery input leads.