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Bad Motor Coil

The VEX motors use polymer PTC protection devices which will trip before damage is caused to the motor. For the 269 motor, which has a stall current of 2.6A, the PTC will trip if the current is around 1.5A for a few seconds. The PTC trip value is not fixed, with more current they will trip sooner, they also will trip sooner as they heat up which is why the motors fail sooner when hot.