a capacitor is used to level out the power consumption from the alternator. when a system (esp with high wattage subs) hits a loud note, it drains more power for a brief moment...a /\/\/\ kind of pattern is formed (graph of power consumption). a camacitor draws power from the alternator evenly and remains charged at all times when the system is turned on. when a big note is hit, the cap provides the extra punch to the amps instead of directly from the alt...thus it keeps the lights from dimming (as much at least) and allows a higher wattage system to be run off a lower output alt (eg a stock alt).



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