How to Test a Capacitor with a Digital Multimeter video - Capacitor Booster Install - Hard Start Kit

How to test an AC Start Capacitor to see if it's good or not. Also the use of a Capacitor Booster for older compressors that need an extra kick to get going.

For capacitor testing, a multimeter is required. Some digital meters have a capacitance setting. First the power supply should be shut off then the two terminals on the capacitor should be shorted across with a screwdriver. This will discharge the unit so you do not receive a shock. Disconnect the wires from the capacitor. Then, the leads of the meter are placed on the terminals and a reading is obtained. The reading you get should be within 6% of the rating on the capacitor. If your reading is more than 6% lower than the rating, the capacitor should be replaced.

If you have an analog type meter, the capacitor is checked with the meter set to measure resistance. Shut off the power, discharge the capacitor, and disconnect the wires attached to it. Then with the meter on the highest resistance setting, put the leads on the capacitor terminals. The resistance reading should start at zero and go up to maximum.

Some obvious signs that the capacitor is bad are bulging of the unit or an oily substance leaking from it.

The compressor motor is responsible for the largest draw of current, especially when starting. It requires a large amount of power to get it running. A booster temporarily provides the extra voltage required to start the compressor. The increase in voltage is about two times the average system voltage. Once the compressor has started, the booster capacitor will be dropped from the circuit.

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