Amazon.com: 4 AWG Battery Cable 4 Gauge Battery Wires with 3/8 terminals Power Inverter Cables for Solar Boat Marine RV Car (3FT, with 0/2/4/6/8 AWG Connectors) : Automotive
12v dual battery isolator wiring diagram car boat marine
Boat Sense: Marine Battery Basics - The Fisherman
Beginners Guide: Boat Wiring From Scratch | Blue Sea Systems Dual Battery ACR Install - YouTube
How to install voltage sensitive relay (VSR) on a boat including wiring diagram - YouTube