Bypass schott charger?

is there any way i can remove this schott charger and use my regular 72v charger? there has to be a bypass method. have a 72 volt charger hooked up already (previously installed)… I have all power to accessories just no movment or main contactor click. Pin 2 (grey/wht) on controller also has no juice. need to eliminate stuff I dont need and keep stuff to make it move. dont want to replace controller if I dont need ta. Thanks for any help . this is just my hobby, maybe need a different one?