Batterie Switch problem
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There aren't many systems powered when only the Batteries switch is selected ON, but there should be the sound of some avionics in the background, as well as the EFIS Emergency Cooling Fan. On the overhead, the EFIS EMER COOL FAN annunciator should be illuminated, along with the ELECTRIC panel displays and the dome lights.
If none of those things is happening, then that would suggest an installation/activation issue.
We'd recommend unsintalling/reinstalling the F70 & F100, and ensuring that the Activation Key is entered either when running the installer, or on the EFB/tablet after loading into the aircraft.
If the issue persists after a reinstall, we would kindly ask you to contact Just Flight Support for further assistance: https://www.justflight.com/support
Mark - Just Flight