ranchhopper
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Yes understanding the system is helpful I have bought and sold quite a few of these and probably 60 percent of them had bad GPs first place I check is the resistor they go bad and put the full 24 volts to the GPs and fries them all. At least splitting the 12 volt load for the GPs and powering up the rest of the electrical system in the truck between both batteries will help get more life of the batteries in my opinion anyways. Since wiring the GP solenoid off the front battery after the resistor went bad I have never had any issues with killing one or the other batteries in my trucks.