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In a single battery installation, what are the power sources for the
battery charger ?
Ground Service Bus 2 which is powered by either external power
or Transfer Bus 2.

In a dual battery installation Ground Service Bus 1 and Transfer
Bus 1 supply the auxiliary battery charger. The battery charger
and auxiliary battery charger may be powered by the opposite
source if either Ground Service Bus is not powered.
Ground Power and Bus Switching Panel