Isolator Guest Battery 120a 3 Batteries

Guest battery isolators act like an electronic valve that keeps your charging system operating safely. They prevent a higher charged battery from discharging into a lower charged battery, and allow you to connect your engine alternator to both batteries or banks of batteries. These isolators are for regulators with isolation diodes. Alternators: 1 Batteries: 2 Max Alt Output: 120 Amp Base Size: 120 x 178 mm