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Message: <blockquote data-quote="keep_hope_alive" data-source="post: 7000372" data-attributes="member: 576029">an HO alt allows you to use the car and play your system while maintaining voltage above 13V (hopefully around 14V).the stock alt only does ~100A of output above 1500RPM, at idle it will be about half.  that is true with most alts.when you shop for an alt, look for an output curve.a second battery is sometimes helpful - depends on the system and the usage.  A second battery will only help you maintain 12.5V, you need the alt to supply enough current to feed the amp and the entire car (lighting, A/C, engine, etc.) in order to maintain 13.V or greater.your main battery is pretty important - always upgrade that first to a nice AGM that is as large as you can fit.  Kinetik makes a good battery.</blockquote>

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