ProMariner ProIsoCharge Battery Isolator 250Amp 1-Alt 2-Bat - 12V 23123. 23123 System Volts DC 12 Max DC Amps 250 Amp Alternator Input1 Battery Outputs 2 Size 6.95"(l) x 5.875"(w) x 3.125"(h) Weight4 lbs Significantly Smarter... ProIsoCharge delivers...