Quick way i did it when i took my box apart to upgrade it was by not connecting the motor and seeing which way it turned. It didnt rotate the other way when i connected it first (with the wrong polarity) it just got warm in a hurry so i disconnected it and the rest is history. If you dont know which way it should be turning use an orignal pack you have connected with a plug already and test it. I have faith you can do it! hope that was helpfull and made an once of sence
Peace!
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