When the bulb goes out the capacitor is charged (because the voltage across the bulb went from 12volts to 0volts). The connection is similar (alligator clip on one side, probe on the other) but you don't need a voltmeter to monitor voltage. When the voltage stops changing you have charged the capacitor completely.Īnother method for charging involves using an old style test light instead of a resistor. It should start around 12 volts and slowly work its way down to 0 volts. Alternatively you can measure the voltage across the charging resistor. The voltmeter and replace the resistor with the power fuse. Once the voltmeter reads 12 volts (or close to it) you can remove You will need to place a voltmeter across the capacitor A diagram for the capacitor charging setup To put the resistor is in the main power wire fuse holder (the one installed near the battery). Will cause the resistor to heat up and you could be burned. If possible (your capacitor may have come with a resistor for charging).Ī lower wattage resistor will heat up too quickly. I would recommend getting a 1 watt resistor This will increase the charging time and you can use values 1/10th that if you prefer (50-100 ohms). The exact value of the resistor is not critical but I would This is done with a resistor andĪ voltmeter. "charge" your power capacitor before connecting Use caution if you take this route.Ī large amount of energy and they charge very quickly. These "buss bars" are generally bare metal so they can be dangerous if not installed properly. You can even fabricate or purchase "buss bars" which are solid pieces of metal that connect the capacitors both physically and electrically. In the diagram both capacitors have their ground terminals wired together but you could also ground them independently. Here's how to wire two capacitors in a system. To learn more about how car audio capacitors work click here. This keeps any cable losses to a minimum. Ideally the power capacitor should be as close as possible The downside of this type of connection is you don't know if the power capacitor fails since the amplifier will continue to work with or without a working power capacitor. The power capacitor acts like a small battery (power storage) so it is connected as shown in the diagram. This will cause your amplifier's power supply to be cut off. Note that the two terminals do not both connect to the +12 volt power wire. NOTE: If you have a third smaller terminal it is probably the remote turn on for a digital display. With the car audio amplifier +12 volts terminal. The positive terminal is connected "in-line" power capacitor or Stiffening™ capacitor). There is often a lot of confusion on how to wire a car audio capacitor
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