Motor capacitors are an integral component to electric motors, provide a current to the windings of a motor in an alternating fashion, creating a rotational magnetic field. These motors can be found in many everyday appliances and machinery, including washing machines, vacuum cleaners and air conditioning units. Troubleshooting the motor capacitor is a key step in repairing any electric motor.
Disconnect the motor capacitor from its motor leads and remove from the motor housing.
Connect the motor capacitor in series with the 10-amp fuse and 110 volt power line. If the fuse burns out when connected, the capacitor has a dead short and must be replaced. If the fuse does not burn out, leave the line connected for a few seconds to build up a charge in the capacitor.
Disconnect the charged capacitor from the 10-amp fuse and 110 volt power line with caution.
Discharge the capacitor by shorting its two terminals together with the large screwdriver with insulated handle. A good, strong spark should appear, indicating that the motor capacitor is operating properly. A weak or no spark indicates a damaged motor capacitor and must be replaced.
