The only problem is that caps don't do a whole lot for your electrical system. In fact, they do nothing at all for your electrical system. They are passive devices, and only do a marginal job at minimizing light dimming on high-current surges. They don't generate anything, and they are lousy storage devices(they can produce minor voltage-stabilizing signals for approximately .003 seconds before they have discharged 62.3% in a 1 farad cap). They don't solve the root problem at all. The problem is the alternator is not producing enough current to sustain the car's demands AND the stereo system. The only permanent solution is to upgrade the alternator. If you aren't generating the power in the first place, passive devices like batteries and caps will only attempt to mask the problem. If the problem arose in the first place, it will return. It may take a little longer with 2 batteries, but it will return. And why waste $100 on a cap that won't do anything for your electrrical system, when for $200, you can get a high-output alternator that will solve your problem? Check out www.4alterstart.com, they make affordable, warrantied, high-output alternators.
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