DC or direct current motors are the most efficient electrical motors on the market today. Understanding the basic layout of a DC motor can go a long way in the troubleshooting and repair of the motor. There are two major components of an electrical motor called the stator and the rotor. Generally a DC motor uses a permanent magnet and a set of electrical wires called windings. The permanent magnet is like any magnet and is attached to the outside stationary "stator". The stator lies just under the outside round cover of the motor body. The rotor is attached to the motor shaft and the windings provide the electrical magnetic counter-force to move the rotor in either a clockwise or counterclockwise rotation. The electrical power for the windings is conducted through carbon brushes. By following a basic procedure, you can check a DC motor for shorts.  Does this Spark an idea?

Instructions
1
Disconnect the power source from the DC motor. You should expose the bare wire leads that conduct the electrical power into the motor.
2
Remove the DC motor from any mechanical attachment to the machine with the end wrench set. Depending on the machine type, the bolt heads can be either Metric or SAE type bolts. You must be able to freely move the motor shaft (rotor) to thoroughly conduct the motor tests.
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3
Attach the alligator clip leads to each of the motor power input wires.
4
Turn on the volt ohmmeter and switch it to the "Ohms" setting. Touch the lead ends together and the meter should read a direct short or zero