you'd run all the batteries in series, once you do that the first battery that connects to the ground is 12v then the next is 24v so the third battery in line is 36v and the fourth is 48v. when you get to the fourth battery run (2) 1/0 cables to the positive terminal, then feed that to the solenoid bank that controls each rear motor. so the back pumps are wired up so now you go to the sixth battery in the line and hook up (1) 1/0 cable to the positive terminal and then feed that to the solenoids (3) or (4) solenoids to have feeding the motor to the front.
Its that simple, not hard upload photos if yo have questions. Im also assuming the switch wires and solenoids are already installed.
Thanks for that information!. I saw in another post where the guy ran some of the batteries in parallel form to archive the 72 volt running one bank. But didn't understand which one is better or is it just a preference? Do you know what the difference is?