This is the most common misconception in car audio... a cap will not 'fix' voltage issues if you are not producing enough voltage in the first place. If your lights are still dimming, you need a bigger alternator.
You wouldn't open a savings account because you spend more than what you make would you?
Your alternator is like your job, the more you make, the better off you are. You have to make more than you spend.
Your battery is like your checking account. The common place for all the money you make and the distribution point in which all money is paid out.
Your capacitor is like a savings account. Money set aside for when you need it immediately. But remember you have to replace it, and if you aren't making enough in the first place it is useless.
Your amplifier is like your wife/girlfriend. The biggest spender, but since you enjoy what she does, you have to accomodate for the amount she spends.
Source(s):
6+ years professional car audio installer
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