After watching tutorials, referring to the Black SQ Manuals, and using various checklists, I can successfully start the Analogue King Air (battery start), enter a flight plan, and take off. But then the avionics go dark. The avionic master is "ON", and other switches are per checklists. I cannot find any electrical faults, and there are no warnings indicated. Global Failures Rate is set to "No Failures". Any ideas what I could be doing wrong?