A capacitor is only good so far as the audio system isn't trying to pull too much from the electrical system. A cap doesn't provide more power, it's designed to 'stiffen' the voltage to the amp, nothing else. If the current isn't there, a cap won't help.
The alternator must have at least 20% more amperage power than the entire vehicle and sound system combined for a cap to be of benefit and even then the benefit is purely for voltage conditioning and has nothing to do with power conditioning.
THEY DO NOT HELP WITH DIMMING LIGHTS.
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