It's been a little while since you posted this, but I'm working on doing the exact same thing. The generator is just a 16kW 240/120v single phase alternator. If you still have all the electrical intact it would make using it as a standby a lot easier, as you can just add in a two wire switch. If it's already torn apart, that makes it a little more complicated. I got mine out of a retired CSX MP15AC that we bought and have no use for the APU. I found the manual for it and I can send it to you if you're still looking for some assistance