X STANDBY PWR OFF light IS ON
X TRANSFER BUS OFF light IS ON
X BUS OFF light IS ON

Those are correct. They should illuminate as soon as the Battery is switched on.

Then, when you engage the first Apu gen switch it should extinguish both TRANSFER BUS OFF lights and the BUS OFF light corresponding to that switch, then the second Apu gen switch ON will extinguish the remaining BUS OFF light.

Currently the first Apu gen switched to ON will extinguish all four amber lights, and I can't tell if that's merely a visual bug or an actual electrical error.

BTW, Mark are you certain you don't have FSUIPC infinite battery selected or the electric_always_available=1 in the .cfg?

I only ask because at one time you had the dead battery issue and now you don't, and also you stated that you can run forever on just battery power alone, which should be impossible without some sort of infinite battery value assigned.