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<blockquote data-quote="hispls" data-source="post: 8834196" data-attributes="member: 614752">Indeed.&nbsp; Again, if you don&#039;t mind the space and weight of a couple more AGMs there&#039;s no need to open that can of worms at the 3000W point.I can&#039;t think of too many applications where an isolator is appropriate for car audio and &quot;deep cycle&quot; or not you probably don&#039;t want to deep cycle any sort of lead acid battery if you can help it.&nbsp; Just connect the two + terminals with some heavy wire, ideally fuse within 18&quot; of each + terminal so that if you have a failure in that cable neither battery will be able to dead short to ground.&nbsp; Fuse should be appropriate sized to your alternator.Ground as close to the secondary batteries as possible, find a good spot with some thick steel, grind/sand off paint until it&#039;s shiny and goop some vaseline or dielectric grease over it after it is secured to prevent corrosion.</blockquote>

[QUOTE="hispls, post: 8834196, member: 614752"] Indeed. Again, if you don't mind the space and weight of a couple more AGMs there's no need to open that can of worms at the 3000W point. I can't think of too many applications where an isolator is appropriate for car audio and "deep cycle" or not you probably don't want to deep cycle any sort of lead acid battery if you can help it. Just connect the two + terminals with some heavy wire, ideally fuse within 18" of each + terminal so that if you have a failure in that cable neither battery will be able to dead short to ground. Fuse should be appropriate sized to your alternator. Ground as close to the secondary batteries as possible, find a good spot with some thick steel, grind/sand off paint until it's shiny and goop some vaseline or dielectric grease over it after it is secured to prevent corrosion. [/QUOTE]

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