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Wiring, Electrical & Installation
2nd Battery charging cable size
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<blockquote data-quote="metalheadjoe" data-source="post: 8790153" data-attributes="member: 581422"><p>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.</p><p></p><p>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.</p><p></p><p>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.</p></blockquote><p></p>
[QUOTE="metalheadjoe, post: 8790153, 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. [/QUOTE]
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2nd Battery charging cable size
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