Hi flaviossa,
You're welcome; I hope the changes fix everything for you.
If not: I've continued to experiment, and changing a few values in aircraft.cfg in the [electrical] section will keep everything running and the battery won't wimp out:
max_battery_voltage = 24 (defaults in my install to 12)
generator_alternator_voltage = 28 (defaults in my install to 14)
max_generator_alternator_amps = 150 (defaults in my install to 60)
I'm not sure of the actual voltages and amperage in the SR8B/8E, this just keeps things working for me. You'll notice that the value you put in max_battery_voltage will show up on the Volts gauge in the cockpit. I'd imagine if working properly that this would run down over time without the generator switched on.
The Amperage meter with the above settings doesn't show much action when you switch things on and off.
Again, if I had the stats for the actual SR8 electrical system, and understood how this section of the aircraft.cfg worked better, I could probably tweak it more to get both Volts and Amperage showing up right, in response to various actions (switching on GPS, lights, etc.). On the other hand, I've heard repeatedly that the FSX battery is an old, run-down beast that'll drain at a moment's notice, so looking for accuracy in this system is probably on the road to hell and frustration. I've set it to what works, above (I've also reduced all the amperage figures below from 17 to about 9, and the max volt draw to from .4 to .9, depending on the system, just out of curiosity to see what happens).
I suspect if I upped the amperage values for all the subsystems, eventually I'd be back where I started, either unable to start or with my GPS conking out on me in-flight. Having that all work and the Amperage gauge being basically dead in the cockpit is a preferable option for me at this point, since I'm operating on the patient with a fork and kitchen knife while trying to do a gall bladder removal.
Interested in this plane, I really enjoy flying it. You might also want to consider reducing the elevator_trim_effectiveness a notch, it seems to be kind of heavy in effect at its current setting (just as the same value for the Alabeo Staggerwing will have you trying to push the stick deep into your chest to pull up at its default setting).
Hey... nothing's perfect! Contented now. And, I learned a little bit about the FSX wonky electrical system, and my OCD is now unfortunately intrigued, though I don't know how to find out more.....
Best,
Steve
p.s. note: when I originally purchased the software from Flightsimstore.com, the file date on the executable inside the .zip file was 5/25/2013.
I re-downloaded it tonight and the date on the file was 5/27/2013, plus the number of KB was different for the file. Now I'm not sure whether I have latest release purchased.....? I did install the patch and military expansion offering, but just mentioning this as a possible factor in my odd mystery. The latest download still had the things that caused my original set of problems, fortunately I saved my aircraft.cfg so it's all good.