67-69 Dart Ignition Switch Pinout
^^This^^ demonstrates that Ignition 2 and Starter terminals are insulated from each other.
Only when the key is held in start position, are they electrically connected to each other.
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This is probably the one most people will want to refer to.
B is for Battery, which is shorthand for power regardless of whether its from the alternator or battery.
So this shows which terminals get connected to power when the key is in each position; accessory, off, run, and start.