I know you posted this 9 days ago, but this is indeed due to the inop inverter switch, which has its own thread. If you use Axis and Ohs or Spad, you can bind the inverter switch and the Elec alert extinguishes, check out this post: [MSFS2024] Saab 340B - #191 by RPGamerous
I can report that switching the inverter on has no effect on the light intensity, which is also bugged for me.