Without knowing your tractor model or seeing the rest of the wire diagram I can't say for sure, but in general the "B" terminal on the key switch is the 12 volt input to the switch. In other words, the hot lead.
In your picture the "B" terminal wire is red/white so you don't want that.
Terminal "A1" (white wire) connects to "B" (12 volts) when the key is turned to Run 1, Run 2, or Start.
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