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Message: <blockquote data-quote="johnecon2001" data-source="post: 2151584" data-attributes="member: 556589">Quit passing out false info.Based on some simple Jr. High math, you can easily figure out what he needs above his stock alt.If his amps are putting out closer to say 300-350 a piece, and his speaker amp is maybe 200. You get 900 watts total. At 100% effeciency (which no amp has, its more like 40-70% or less) you need 65A to run the amps (900w / 13.8v = 65.21A).But like I said, the efficiency level will be no where close to 100%. So you can take that 65A and cut it in half. That's on top of the stock alt, which probably has a little bit of leaway in it.A 120A alternator would do fine for him... but he should still try the big 3 first.</blockquote>

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