Some questions for you. If you don't mind.
1. Have you have added the electric_always_available=1 to you aircraft.cfg?
2. If you haven't added that line, are you having trouble with loss of avionics power?
3. If you haven't added that line AND you aren't having that problem, could you please guide us through what you do from a Cold-n-Dark cockpit to the knob/button settings for maintaining power?

Markoz,

I have not added anything to the .cfg file and as long as I keep the engines running I have no problem with loss of power.

Let's see if I can remember all the steps to get the old bird fired up from the cold....

1. Cockpit safety check. Hyd pump switches off, gear, gear doors and flaps handles agree - you don't want anything moving until clear.
2. Battery ON - check voltage
3. Fire test APU then start up APU.
   Check volts and freqs of APU and close AGR to connect to aircraft busses. Essential power to APU
   Note: I do not find a master avionics switch on the pilots overhead??? I wonder how the radios are turned on???
4. On F/E panel make sure all bleed valves are open - packs off - to get engine start air. Manifold pressure around 40 psi.
   If you're not starting engines at this time, turn on packs for air temp control in plane.
5. When clear by ground - HYD B pumps on. Make sure brakes are parked or chocked.
6. Load fuel to desired level.
7. Turn off packs to start engines.
8. As each engine is started, F/E checks engine gen volts and freq [ 115 volts & 400 cycles ]
   Select Essential Power to engine one and close MGR to change over power from APU. Do same with each engine.
9. After engine start, turn on A/C packs.

That should get you started...

The more I play with the CS-727 the more fun I have! It's pretty good indeed.
If you could have seen the multi-million dollar simulator we had in the 60's you would laugh.
Now, today, the simulators we train in are super, but back then the CS-727 would have been heaven.
I wish I would have kept my old 727 books.

Lou