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I was curious enough I pulled the pass seat and fired up the Detroit, waited until the glow plugs stopped pulsing and read exactly the same voltage on the batteries, 28.6V across both of them and 14.3V across each battery, I am powering a transmission (6L80) and a lift pump on the 14V tap. It...

Sorry, my bad you do show the connections between batteries, man I am getting old and was on the phone with my sister,,,, but still check it out. The wire with the yellow sleeve goes to your 14V tap on the regulator, the other should feed the transmission

That is only on the 60A system, the dual voltage system should keep them in balance.

Check the 14V tap on your regulator, I do not see a connection to the middle of the batteries, but you do not show both connections. Make sure the 14v tap on the regulator is reading the same as the connection between batteries. If the voltage is the same it could possibly be a bad regulator