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Ah, ok. If you removed the interlink cable then parasitic shorts should not be able to drain the battery. It sounds like they simply self-discharged over the year. When they sit that way, the battery plates sulfate and they are more or less ruined. There are various methods described on the...

People really give electrical systems low priority on their vehicles...until it finally kills the vehicle. It sounds like you have a lot of sorting out to do. You can start by checking the voltage at the batteries once you get the truck running. If the voltage is around 24v, the batteries are...