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Message: <blockquote data-quote="audiolife" data-source="post: 2195821" data-attributes="member: 541383"><p>leave factory battery alone add the big three wires run one 0 ga wire from main battery + to support battery+ then if the main battery is grounded to the back  you can run a ground off the - of the support battery to the same point or to the chassis (also 0 ga). it also depends on what size the support battery is and what are both batteries.....</p></blockquote><p></p>

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