ok me again, how important is it to solder the negative from the second battery directly to the ground terminal on the board vs. the negative terminal in the 'tub' of the car? the negative battery terminal has a wire already going to the ground on the board so this should work fine right? I know QFM and
http://foy.foy.com/minircmod/moddocs...attinstruc.htm have the negative of the final battery going straight to the board what's the difference? Anyone, anyone, Bueller... Bueller? Thanks!