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Message: <blockquote data-quote="metalheadjoe" data-source="post: 8790153" data-attributes="member: 581422">Since no one else answered the question... The highest current flow is between the rear battery and the amp, so double runs there is a good idea. Sizing between the front and rear batteries depends on current capacity of each battery and alternator output. For a stock alternator and typical front battery, a single run will be fine. You can never have too much conductivity, so more wire is always better.In my vehicle, I have two runs of 1/0 from the rear battery to the amp and one run of 1/0 from the front battery to the rear battery, and it works great. I would start with that. You can always add more if needed.Don't bother with a battery isolator unless you plan on running it long with the vehicle off. They are meant to prevent you from draining your starting battery and being stranded.</blockquote>

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