viking just loves talking about capacitors.. I'm starting to think that a capacitor stole your lunch money when you were in school or something.. - (just kidding ) so vik, say that you did not have a "taxed or overloaded electrical system", and you wanted to put capacitors on your system to "smooth out the spikes". can you ever see agreeing that this is not the anti-christ of all ideas? I have plenty alternator, plenty battery, and big enough power wire that I could scrap the wire and buy a new HU.., my amp gets plenty power, and puts out plenty power (it's got all kinds of caps in it). I have two 3farad capacitors and they are great.. my lights don't dim and my other electronics don't bitch about them, and the amp loves them. three years and I don't have any complaints except that the power wire fittings sometimes rattle loose from the vibrations, but that's it. I would not suggest that anyone use caps if they have not upgraded the electrical system, but after you have covered your bases, why not put them on.. if nothing else, the display is much more accurate than the voltmeter/ammeter on your dash, so you can keep a good eye on how your charging system is doing.