This keeps any cable losses to a minimum.

To learn more about how car audio capacitors work click here. Here's how to wire two capacitors in a system. In the diagram both capacitors have their ground terminals wired together but you could also ground them independently. You can even fabricate or purchase "buss bars" which are solid pieces of metal that connect the capacitors both physically and electrically. These "buss bars" are generally bare metal so they can be dangerous if not installed properly. Use caution if you take this route. Power capacitors store a large amount of energy and they charge very quickly.

This is done with a resistor and a voltmeter. The exact value of the resistor is not critical but I would keep it in the k 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 be burned.

A good place to put the resistor is in the main power wire fuse holder the one installed near the battery. Simply substitute the resistor for the fuse.

Car Audio Capacitor Installation

A diagram for the capacitor charging setup is shown below. You will need to place a voltmeter across the capacitor to monitor the voltage.


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Once the voltmeter reads 12 volts or close to it you can remove the voltmeter and replace the resistor with the power fuse. Alternatively you can measure the voltage across the charging resistor. Mount the capacitor to the vehicle per the manufacturer's instructions.

Part 2 of 2: Installing the capacitor

Some capacitors are mounted using screws, and others are mounted using double-sided tape. Cut a wire at the right length to complete the circuit. Using the extra wire that you have, measure a piece that will extend the other circuit wire to the capacitor, and cut it to length. Strip both ends of the section of wire with the pliers.


  • How to Install a Capacitor!
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  • Part 1 of 2: Purpose of a capacitor.
  • Install the other end of the butt connector over the circuit wire. This will go on the wire that was initially cut, supplying the positive power feed to the amplifier or other circuit. Install an eyelet on the other end of the wire and crimp it into place. Install the eyelet and wire onto the positive terminal of the capacitor. Then tighten the terminal nut with the appropriate wrench until it is snug. Install a piece of wire from the negative terminal of the capacitor to a good body ground. Install the negative battery cable.

    Tighten with the terminal wrench until they are snug, then add another quarter turn to tighten. Start your vehicle and allow the capacitor to charge. Once it is charged, you can use the circuit that it is installed in. Once the capacitor is properly installed, the circuit can be used. When installing a capacitor it is important to use caution, as a capacitor can easily shock you.


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    • Make sure that it is installed in such a way that it cannot accidentally touch anyone. If you are not comfortable with any part of this installation, call a certified mechanic from YourMechanic to come to you and install the capacitor. Our certified mobile mechanics make house calls in over 2, U.

      Fast, free online quotes for your car repair. Not sure what your car needs? Home Articles How to Install a Capacitor. Part 1 of 2: Purpose of a capacitor A capacitor is a storage device for electrical power or voltage. Capacitors are used to store electrical power. Once they are fully charged, they can release that voltage if they are touched. Large capacitors can cause serious electrical shocks and can even injure you.

      You may need to install a capacitor if you have a: Stereo system Winch Exterior lighting system Hydraulics Other electrical circuits, not listed here but which can draw a lot of power from your vehicle's electrical system, may also require a capacitor to operate correctly. Part 2 of 2: Park your car on a flat surface and apply the parking brake. Install the memory saver per its manufacturer's instructions.

      How to Install a Capacitor | YourMechanic Advice

      Remove the memory saver. The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details. Need Help With Your Car?