Cadmium plated isolator with terminal nuts and lock-washers. 3 terminal isolator for metal frame ground systems, 4 terminals has inuslated ground terminal for use with fiberglass or other non-conductive materials. Isolates starting battery, provides secondary battery current for auxiliary power and full time charging of both batteries.
The Westin T-Max dual battery current control systems automatically connect both batteries for charging, but separate them when discharging. This system also includes a manual override and automatic safety protection.