KingAir 350 loses electric power after 5 minutes

Whenever I use the PL21 or G1000 mod in the FS2020 Kingair,the electric power goes dark after about 5 minutes. I have read that the starters need to be turned off after the engines are fully started but this still happens when I do that. Any ideas?

Are there alternators and/or generators to turn on. Sounds like you’re running on battery power until it goes flat.

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Yes, I turned on the 2 generators after I started the engines. To be clear, this does not occur if I use the default avionics (G3000 I believe), only when using the mods. I don’t know why that should matter.

Correction- it has now happened with all default avionics.