Ronmar
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you can leave ground connected to the truck, but disconnect AND INSULATE the terminals on the 14, 28 and E terminal cables.
Connect one jumper cable lead from alt gnd terminal to - on your 24v test battery
connect a second jumper cable lead from the 14V alt terminal to the middle of your 24V battery(where the two batts are tied together).
connect a 3rd lead between the 28V alt terminal and the +24 terminal on your 24v battery.
once running and all the cables are good, use a small jumper from the alt 28v terminal to the E terminal on the regulator to bring the alt online then you can start measuring voltages...
Connect one jumper cable lead from alt gnd terminal to - on your 24v test battery
connect a second jumper cable lead from the 14V alt terminal to the middle of your 24V battery(where the two batts are tied together).
connect a 3rd lead between the 28V alt terminal and the +24 terminal on your 24v battery.
once running and all the cables are good, use a small jumper from the alt 28v terminal to the E terminal on the regulator to bring the alt online then you can start measuring voltages...