Could there be a generator switch someplace you're missing turning on when you start up?
A "fix" to needing a Gen SW but not having one on the panel is to start the flight with a default plane, like a C172, B737 or something on the runway, running, from the freeflight screen. THEN switch over to the C-130, after you're sure the default plane's generator, battery, avionics, etc are all switched on.
I don't KNOW that that will solve the problem, but it may point you in the right direction, maybe. I had that problem with a B206, no I don't recall which one, but loading the default B206 first, then switching over solved it. So I put in a Generator switch in the trouble bird, and voila! Problem solved. Again, it may, or may not, fix your situation.
Just a thought. Hope it helps!
Pat☺
Edit: Is it a freeware plane? If it is, may I inquire as to which zipfile it is, and from where? Maybe I can DL it and take a look to see what's what? No promises, but...