When we jump it off it starts but when we try and start it under it's own battery it wont! The starter clicks when the switch is turned so the starter is good, the battery sparked when we tested it so we know the battery is good! Do riding lawn mowers have alternators or could it be the battery! I charged the battery and it actually started on it's own but when we cut it off and tried to start it again we got nothing but clicking from the starter! If the mowers have alternators please give me some info on where it's located! Please help!!!