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Message: <blockquote data-quote="loopkiller" data-source="post: 5492682" data-attributes="member: 601690">n2audio I agree that the 2 gauge should be plenty for the short runs to do his Big 3. However I still think that if he were to measure his voltage with music and then again with a test tone, he would see a big variance there. I would expect his alt to make full power for a test tone, but not for music. The reason why is that when you play music, the bass notes are random and the alt just cannot ramp up and down in output fast enough to keep up with demand. That is where the rear battery would help him. It would ensure his voltages would stay above 12v for sure. A single group 27 or 31 would give him a serious boost IMHO.I would like to se the OP run a test tone and report back with a reading. Like a 5 ~ 10 second burp.</blockquote>

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