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Message: <blockquote data-quote="bubbagumper6" data-source="post: 6792221" data-attributes="member: 567719">Just stop being lazy and do the big 3.  You can't just say the battery up front won't be used for the system, it's still going to be connected in parallel with the back batteries and thus be part of the complete electrical system.  Grounding the engine block is essentially grounding the chassis of the alternator which is required for you to have a complete 1/0 circuit.  If you left that part out you might as well run 8 gauge power from your alt to your batts.Bottom line is, just do the big 3.  There's a reason it's recommended so highly and hasn't been changed in years.</blockquote>

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