On the 350 farmall I bought I've been using it quite a bit this week and it's been starting great but today I was mowing with it and left it sit for about a half hour when I was done and the starter just kinda buzzed. I left it set awhile longer with the battery charger on it and it fired up. Then I went and unhooked the mower and put it in the barn shut it off and tried to start it then it just buzzed again. The battery is new this year I'm thinking the starter is just week and plan on having it tested this week. Does this sound like that's it? It's a gas tractor but the widths 12v system with a generator