Vax 11/750 power supply questions

Well, thanks to the advice of a knowledgeable Lowe's employee and a sheet of 3/4" plywood, I was able to move my Vax 11/750, by myself, from the garage into the basement. Initially, when I first unloaded the Vax machine lighter. I labeled the wires with masking tape, so as to get everything back correctly. I have cleaned and reassembled the power supply section save for one connector. It's a 20 pin ribbon cable that plugs into the top of the power controller, coming don't know which direction it should go - unfortunately the way the cable is folded it could really go either way. So, those of you that own a Vax 11/750 - which side should be pin 1? Also, on each power supply, there is a three position toggle switch - Lo, Norm and Hi. What is this for? Similarly, I currently have the battery backup unit removed. It's obviously going to be totally shot - the sticker indicates the batteries were last changed in 1984. This isn't needed for the machine to work, correct? I'm not talking about the Time Of Year battery, I'm talking about the box mounted on the front left side, it has a couple lead acid battery packs in it - not enough to run the computer, I would think - did this just keep the memory alive? What's the pinout of the console port? Anything special, or should a null modem cable be all I need to connect a terminal? Thanks! -Ian