The Power Products 2-Gauge 21 4-Battery Harness Cable keeps you Ready for the Road Ahead, permitting connection of four parallel batteries while being easy to install. Safely connect the terminal ends of your trucks battery to the electrical system to gain the working charge your rig requires for a successful start. Boasting of durable PVC insulation, this heavy duty battery harness cable ensures the durability to withstand the high heat demands of your vehicle, keeping your rig powered. FleetPride is your First Click in Heavy Duty.