My tractor is a 2005 New Holland TC30, it will not start unless I jump it from battery to solenoid. Even if I do this it will run for a while then die, won't restart unless I jump it, but only after something cools off. I know there are several safety start switches, but not sure where they are and how to check them, I have already bypassed the seat switch. Any IDEAS about what the problem or problems are.