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Normally the blue is not attached to the starter solenoid. It provides power to the fuel solenoid; therefore, if connected to the battery hot side it would drain the battery while the engine off. It also can damage the fuel solenoid if solenoid is continuously powered up.
Actually the wiring schematic don't even show the small red wire attached to the solenoid as they intended for the stator to be only connect via the ignition switch while the switch is in the run and start positions. Hence connected to the blue wire only. But it can be connected as in the image, just not to blue wire. The blue goes to the fuel solenoid.
BTW the starter is grounded via the engine to frame connection.