First, try charging battery for 24 hours. Second, test voltage on battery with a volt meter and make sure it has at least 24 volts. Third, make sure contact points on the battery are clean and free of rust. Clean with rubbing alcohol and 3M Scotch pad if necessary. Apply dialectic grease to contact points to increase connectivity. When connecting the battery to the control box, make sure that you hear a click sound to be sure the contact points are completely connected. If there is a gap between the battery and control box, it may not have proper the proper contact needed to operate. If that fails, give us a call at 888-687-3552 or 406-549-0769.