Car Audio Power 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. The positive terminal is connected "in-line" with the car audio amplifier +12 volts terminal. See the diagram below.
Ideally the power capacitor should be as close as possible to the amplifier. Within a couple of feet is acceptable.
Here's how to wire two capacitors in a system.
NOTE OF CAUTION: Power capacitors store a large amount of energy and they charge very quickly. You must first "charge" your power capacitor using a resistor before connecting it directly to +12 volts. This is done with a 1k ohm resistor and a voltmeter. The exact value of the resistor is not critical but I would keep it in the 500-1k ohm range. I would recommend getting a 1 watt resistor if possible (your capacitor may have come with a resistor for charging). A lower wattage resistor will heat up too quickly. Also, do not hold the resistor with your bare hand. The current flowing through the resistor will cause the resistor to heat up and you could get burned. A good place to put the capacitor is in the main power wire fuse holder. Simply substitute the resistor for the fuse. A diagram for the capacitor charging setup is shown below. You will need to place a voltmeter across the capacitor to monitor the voltage. Once the voltmeter reads 12 volts you can remove the voltmeter and replace the resistor with the power fuse.
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