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They're 12v batteries, wired as 2 strings of 2 batteries each, assuming nobody has replaced them with something weird. Most 12v battery chargers are isolated enough to allow you to just connect them to a pair of batteries in a string and they'll happily charge it. If you do it that way, take a...

Alternators designed to charge off-grid batteries include all sorts of limit systems, as well as overbuilt cooling. Rotor temp sensing, stator temp, erectifier & regulator temp, battery temp, compensation for voltage drop in battery cables, etc. Charging a dead 4-battery system is a lot to ask...