Someone made the comment that in a C172 SP with a G1000 the alternator charges the main battery, and then the main battery supplies the power to the bus in normal flight. Rather than the alternator powering the bus directly and charging the battery as needed. Deosn't seem right. I looked through the AFM, but don't have enough electrical background to sort this out. It does say that whenever the ALT part of the Master Switch is on, the BAT part should be on too. Does anyone know for sure? Any place in the AFM that makes this clear?
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