How to Install a Capacitor (with Pictures) - wikiHow METHODTIPSWARNINGSTHINGS NEEDED Understand the basic idea of a capacitor. The capacitor acts as a storage tank for electrical power. The amount of power that the capacitor can store is measured in Farads and the general rule of thumb is that you will need one Farad of capacitance for every one kilowatt (or 1,000 Watts) of power demand in your system.Decide whether or not you want an internal meter. Some capacitors come with built in meters that diSee all 3 steps on wwwhow70%(17)Published: Jun 12, 2011Views: 213K Car Audio Capacitor Installation Car Audio Capacitor Installation . There is often a lot of confusion on how to wire a car audio capacitor (a.k.a. power capacitor or Stiffening™ capacitor). There are two terminals on a car audio capacitor. A positive and a negative. The negative terminal is connected to ground.