Thanks Mike: I've watched that video about a dozen times. Unfortunately he doesn't show the steps where the negative wires from the battery or the motor hook to the board. Think I have most of it figured out from an old http://www.lawnmowerforum.com/ posting, but now need now to know where the negative cable from the motor connects at the pc board.Although this is not a wiring diagram, this video may help you figure it out. I can't tell for sure, but it looks like there may be 3 separate battery connections. The connection in the forground is the internal jumper that connects the two 12 volt batteries in series to form a 24 volt battery, and the background connections are to the mower circuitry with positive wire on top and the negative wire on the bottom.