Club Car will only run with Charger Plugged in

[Ntwestja]

I have a 95 club car. I have charged all the batteries individually and have 51 volts across the pack. I have replaced the solenoid and I have not done anything to the OBC. The solenoid will click when you turn the key on, then when you press the pedal the solenoid will click once and seems like it clicks back off and the cart will not move. I can plug the charger in and the cart will move with no problem. If I keep the pedal pressed just enough to keep the motor engaged and unplug the charger it will continue to move until I let off the pedal. So basically the cart will not move unless the charges is plugged up. I have also ran a jumper from the negative side of the battery pack to the solenoid and it engages and stays engaged when you turn the switch on, but the cart still will not move unless you hook the charger up. I know the lockout circuit in the OBC is supposed to keep the cart from moving when the charger is plugged up, but I bought this cart second handed so I do not know what was done before. I have had this cart working before, I just removed the batteries and put on another cart. I know have good batteries back on it and can't get it to move without the charger plugged up. Any help will be greatly appreciated.