Tekonsha Battery Switch 4 Terminal 12 Volt Continuous Duty Insulated. Cadmium-plated isolator with terminal nuts and lock-washers Contains an insulated ground terminal for use with fiberglass or other non-conductive materials Isolates the starting battery Provides secondary battery current for auxiliary power Package Contents: Tekonsha 7001 Battery Switch 4 Terminal 12 Volt Continuous Duty Insulated Tekonsha 7001: Battery Switch 4 Terminal 12 Volt Continuous Duty Insulated