Discharging the Capacitor:
If you plan to remove your capacitor for any reason, you may want to completely discharge the capacitor to avoid a potential hazard. To discharge the capacitor (only after it's disconnected from the system, of course), will need to enable the current to flow from one terminal to the other. You can use either a test light or resistor for this purpose. Some large capacitors tend to develop a charge similar to a battery and will produce a small voltage across its terminals. Since, in a large capacitor (over .5 farad), even a small voltage could be dangerous. After it is discharged, you may want to connect the terminals together with a piece of wire or resistor. Even if the capacitor design doesn't permit it to develop adverse voltages when unused, leave the terminals connected as a visual confirmation of the unit's safety.