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I'm not sure if your M15's battery is rear or front mounted, but on the cable that has the battery clip, there's a small fuse box. The fuse is inside that. Check it to make sure it isn't burned.
If the fuse is ok, then you can check to see if you actually have an eletrical problem. Remove the motor from the grip, and connect the leads to it. Hold the motor and pull the trigger to see if it actually works. If it works, you can confirm that the problem is inside the mechbox and not electrical. If it doesn't work, then you know you have an electrical problem.
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