I have a Gravely 60" zeroturn that evidently is not charging. Just wondering if any of you guys could point me in the right direction to troubleshoot and hopefully locate the problem. I can charge the battery with a battery tender and run the mower, but after 2 or so hours mowing it will not crank back up. Yesterday I checked voltage across the battery terminals while it was running and got 13 volts. Mowed a little today and checked voltage again while it was running and had 12 volts. Any help or suggestions would be appreciated. Thanks