My 16HP Kohler Command won't turn over. I replaced the battery, and it still won't turn over. The lights work, but it just won't turn over. I have owned it seven years, and never had a single problem with it. I have the exact same problem with a 17HP Briggs & Stratton I/C Twin-Cylinder, it won't turn over either. Both mowers haven't been run for over a year because of this problem. Any help would be greatly appreciated. I need to sell the mowers right away.