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Well, I should have said that I am flying an older C182 that has an upgraded panel with a garmin 430w and stratus 2s. what i'm looking for is a Cessna-approved wiring diagram that shows exactly what the alt avionics master actually does. thanks.

I am still unsure Why there is an alternate avionics master. I understand about the master battery contactor relay (having learned the hard way what happens when it fails) but i don't see what the "alternate avionics master" does. Does it by-pass the switch, the contactor, or what. Does it...