From the AW tech notes
ELECTRICAL POWER – MAJOR COMPONENTS
STARTER-GENERATOR
Two 9-kW DC starter-generators are used to start the relevant engine and, when the engine is running, to produce DC power.
The starter-generator no. 1 is connected to the MAIN BUS 1; the starter- generator no. 2 is connected to the MAIN BUS 2.
If the bus tie is left in auto in the situation you describe, the no2 starter gen will not be powered.