The capacitor stores a small amount of electrical energy. Discharge capacitor by placing a screw driver across the terminals. Use a screwdriver with a non-metallic handle and a shaft that is longer than 4” (10.75mm) Touch the metal shaft of the screwdriver simultaneously to both metal terminals of the capacitor. There should be a spark.
If the capacitor sparks, you can stop reading here. The spark indicates that the capacitor is working properly. If the capacitor does not spark, read on to Step 6.