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Yep, the biggest killer of batteries is low state of charge. In meeting the cold crank milspec without properly sizing the alt to support so large a battery bank, they set up a situation where the batteries have trouble reaching full charge unless run very long hours. Depleted batteries keep...

You can drop to two batts at any time, simply lift the battery leads off of the terminals of either the forward or rear pair of batteries and insulate those connections. Unless you are running the 260A alt, four 6t batts can be really hard on that very ecpensive alt. 2 batts are a much better...

Anything over a group 27 will provide plenty unless it is VERY cold. Cat specced a pair of group 31s for the equipment using these engines. A 31 typically delivers ~1000 CCA... All the kodiaks out there with 3116/3126 engines use similar battery size. I measured my 3116 start current once...

Only if you set them just right To fit between the blocks in the lid…

That will kill the vampire. The main switch turns on the 24V control/ign power relay using 12V, so cutting off only the 12 at the battery completely disables the vehicle and all the lighting as those are always hot…

Yep, a pair of 31’s is a much better matchup to the engine and electrical system… The alternator also says thanks:) Another thing these trucks need, especially if they set more than they drive, is either a balancer and float charger combination, or a disconnect switch to deal with the 12v...