cbrookhart.
If you have the captsim c-130,direct from this site via a download,you will have the manuals.
Select start\all programes\captainsim\legendary c-130\flight manual.
The other thing to check is the overhead panel,by the gen switches,if the red gen light is on after the engines are started,then the gens are off line.
I set my c-130 up in the cold dark condition,and got the radios to work of batt for a short period,then they went dead.
I got the ground cart conected,started the gtc,got air to the engines,and once i fired up number 1 eng ,put gen1 on line,and the radios started to work.
hope this helps you.
regards alan. 8-)