Heavy-Duty Automatic Battery Isolators - BATTERY ISOLATORS Run accessories in vehicle without draining battery Automatically charges auxiliary battery as you drive, never overcharges Self-contained electrical system converts alternator or generator to safe, efficient charger Automatically isolate both the auxiliary and vehicle batteries so the discharge of one does not drain the other's power. Handle alternators up to 160 amps. Rectifiers and heat sink allow maximum heat dissipation without mechanical attachment. Eliminate shorting problems. Solid state. For all 6- to 36-volt, negative-ground electrical systems. UL listed. Choice of 2-battery systems (one vehicle battery and one auxiliary) and 3-battery systems (one vehicle battery and 2 auxiliaries). Choose isolators, connector kit, and emergency start battery isolator. Applications: All Makes All Models