The ABC 12 Volt series utilize SCR charging circuitry, individually sensing and regulating each of 2 isolated battery banks, allowing the user to leave the charger operating indefinitely, even under no-load conditions without fear of overcharging. These chargers are ideal for vessels which have intermittent demand for battery power. This series is housed in a rugged, black anodized aluminum, heat-sink case which extracts heat without introducing the marine atmosphere to the inside of the unit. ABC chargers feature total output ammeter, on-off power switch, power "on" indicator light, 115-230 VAC input voltage selector switch, factory installed AC power cord with molded plug and shock-resistant rubber mounting grommets. Circuit boards are polyurethane conformal coated for corrosion resistance and all are protected against overheating by an automatically resetting thermal switch.