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Take the motor out of the grip and hook up the wires to it. Pull the trigger to confirm it is turning. (and it does matter which terminal the +ve and -ve go to, if they're backwards, you'll just blow fuses or heat things up if you're not running a fuse)
If the motor is spinning, put it back in and use your thumb/finger on the motor housing to hold it in place (don't shock yourself) and see if it goes. If it doesn't, you've got a problem inside the mechbox.
Good luck
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