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Message: <blockquote data-quote="Doxquzme" data-source="post: 8848996" data-attributes="member: 689267">This sounds like voltge drop issue or inadequate voltage on demand. Unless you intend to get even crazier with the wattage end of things, the 320A should be fine. The 5k is likley to pull around 360A at full throttle so you should be okay since you have the big 3 and a 2nd battery. If you have different batteries, types, then it is advisable that you isolate the 2nd one too, 500A isolaters are aroun $40-50 and are worth the investiment in by experience. Not sure if that matters here but always a good idea when the battery types front and rear are different types ie L/A up front and AGM for your audio. If your primary battery is pulling from the 2nd (for any number of reasons) the spare "juice" may not be there when you are cranking it up.[MEDIA=amazon]B082HMDMLG[/MEDIA]</blockquote>

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