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If you have access to the wiring diagrams, I have seem people apply 12v to the correct pins to reverse the motor, moving the piston back from the rotor.

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You don't need a diagram when confronted with a necessarily reversible motor and a 2-pin connector....

Some have position sensors built in (so the computer knows where things are). But yes - if you only have 2 pins it's self-explanatory.

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