How do i hook up my capacitor

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  5. Part 2 of 2: Installing the capacitor.

Use our easy diagnostic tool. It can be upsetting to know you just put a bunch of your hard-earned money into a new car stereo , only to realize it sounds terrible. You changed the head unit, added more speakers , and better yet, put in a new amplifier. At first, your new radio sounds great, but then you turn up the volume and it no longer works as you expected.

The amplifier cuts in and out, the speakers are full of static, and even worse, other electrical systems in your car are no longer working properly. You may wonder what went wrong with the installation - but chances are, you have just forgotten to install a capacitor to handle a large stereo system.

Whether it is a stereo that was installed, or another piece of equipment that takes a lot of power to run, a capacitor may be needed to make it work properly. A capacitor is a storage device for electrical power or voltage. Capacitors come in all shapes and sizes, so it is important that you consult an electronic specialist to make sure you purchase the one that is right for your circuit. Once you know what you need, you can purchase it and prepare for the installation, or have it installed into your vehicle by a pro.

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. Disconnect the negative battery cable.

Turn the cable clamp nuts or cable bolts counterclockwise to loosen them. Wiggle the cable free from the top post when it is loose. If it is a side-post battery, completely unscrew the bolt. Locate the power feed circuit that you want to place the capacitor in. On an amplifier, this would be the main battery power wire going to it. Using the pliers, cut the positive feed wire to the circuit. To allow for the right amount of space, you should always splice into the circuit at least six inches from the item receiving the power. Using the pliers, strip the insulation from both ends of the wire you just cut.

Install an eyelet onto one of the wiring ends. Crimp it in place with the pliers.


The eyelet must be made for that size of wire. Once you crimp it into place, you need to make sure that it is tight and secure.

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  3. How to Install a Capacitor?
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Once the capacitor is charged the light will go out because current will no longer be flowing the voltage drop between the power line and the capacitor will be zero. It is no longer necessary to monitor the status of the capacitor. If you used the light method, you can now remove the test light. Disconnect the positive terminal of the capacitor from the resistor and disconnect the resistor from the power wire. It is no longer needed, so you can store it away in case you ever need to charge your capacitor again. Replace the main power fuse. This will allow your audio system to receive power once again.

What do I do if there is no place on a capacitor for a remote wire hookup? Should it come on when the main fuse is put into place, and what would cause the capacitor to power up, but not the amp?

Part 1 of 2: Purpose of a capacitor

Not Helpful 4 Helpful Do I need to use a resistor to charge the capacitor, or can I just use the test light? You can use the test light, but be sure to connect the capacitor in series with the test light. Not Helpful 0 Helpful 2. If both the amp and cap have a remote wire, do I need to split and connect it to both? You will actually just run the remote turn on wire from the amp already hooked up, and then run the turn on to the cap.

Not Helpful 4 Helpful 7. No, it does not matter which one the remote wire goes to first. Not Helpful 1 Helpful 1. I just hooked up a cap in my car and now I'm hearing strange noises coming out my sub-woofer. What could it be? Check the grounds on your cap and amp. Make sure everything has its own separate ground. Not Helpful 0 Helpful 0. Can I run the remote wire for my amp off the remote wire on the capacitor?

Answer this question Flag as What does the abbreviated term ACC means which displays on the power capacitor's head end? Do I have to charge a boss 2. Where do I get a resistor for the capacitor if it did not come with one. Include your email address to get a message when this question is answered. Already answered Not a question Bad question Other. Tips If you find the electrical problem persists even with the extra power from a capacitor, it may be time to upgrade your vehicle's alternator. Keep safety in mind when working with a charged capacitor.

Wear safety glasses or goggles and remove any jewelry before installing the capacitor.

How to Install a Capacitor | YourMechanic Advice

Most capacitor models encompass a safety circuit which will light up a warning if the connections are not correct. If the light comes on, disconnect the capacitor and double-check your connections.. Warnings Never install an uncharged capacitor. 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.

Car Audio Capacitor Installation

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. A diagram for the capacitor charging setup is shown below.

You will need to place a voltmeter across the capacitor to monitor the voltage.