Keeping you Ready for the Road Ahead, the Power Products 2-Gauge 21 4-Battery Harness Cable allows 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 needs for a successful start. Boasting of durable PVC insulation, this heavy duty battery harness cable ensures the longevity you need to withstand the high heat demands of your vehicle, keeping your uptime, up. FleetPride is your First Click in Heavy Duty.