2002 ezgo series cart won't go

Got a 2002 ezgo series without batteries. Put new batteries in it and it will shudder a little but will not move. Put jacks under the back and still, wheels won't move but it seems like they'd like to. Noticed the A2 wire, from the fnr to the motor was getting hot. Replaced with a 4 ga wire and still nothing. Solenoid clicks in forward and reverse but nothing but shudders. Suggestions would be appreciated.