Did you say 12volt at 10 amps. I would think 12v at 1.0 amps would be more like it. If so you have a problem with the motor control. 16 volts may cause problems. Try to put a meter across the motor power supply and see what voltage is being delivered. It should be close to 12v at full speed. However I would expect it to be pulse width modulated for control and you may need a CRO for an accurate assessment.
Barry
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