I have a skid steer that I was working with all day and was running great. I shut it off and went to start it and it turned over and fired but as soon as I released the key it would sputter and die. The battery power looks weak, but the machine still turns over, could this still be the battery being weak? I'm not sure if diesels need the battery after they're started like a gas machine does for spark? Someone please help ....oh yeah how can I access the battery when I can't raise the loader to roll the cab off since the machine won't run? thanks