orion 2500d

1/0 from battery to hopefully rear battery if you plan to run that amp

1/0 from rear battery to distro

4 ga off that since it has dual 4 gauge inputs

and some rca's and some speaker wire would be nice too i suppose

 
might want to consider a big 3 before anything.. appx 10-12' of 0/1 gauge for that plus another 20-25' of 0/1 from the front batt to the back. If you have at least a 120A alternator and a solid (at least) yellow top under the hood with the big 3, then you 'could' get by without that extra battery.. good rca's, 8-12 gauge speaker wire, accessories..

 
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