could be the reagan solenoid going bad..........also keep in mind that new batts are only approx. 80% so you have to break them in .....................10 to 12 complete charge cycles thats very important that you break them in right otherwise
...........................what brand batteries did you buy and you did buy 8 volt batteries and not 6 volt? 8 volt will have 4 water fill holes per batt..............6 volt will have 3 water fill holes per battery so double check that because you won,t beleive how many people don,t pay attention to it, the cart only runs 1/2 speed in reverse so you do have an issue...............................let us know......................................