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The batteries are wired together -- so they make ONE BIG battery. When you disconnect the batteries and then reconnect, the spart is the computers loading up again. IF you have a good battery and a weak battery, the weak one will drain the good battery down.
I suggest you have the batteries tested, because 12 volts is probably not be enough to start a diesel.
I suggest you have the batteries tested, because 12 volts is probably not be enough to start a diesel.
