Check the Cable between the plug and the switch for continuity using the ohmeter or continuity tester part of a cheap multimeter. Place one lead on each of the plug contacts in turn, and the other on the other end of that wire. If this is okay, check the switch for continuity by placing each lead of your tester on the in and out contacts and pressing the trigger. If still no joy, check the brushes. If still no joy, check the motor windings for continuity.
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