pcather,
I don't think the battery or glow plugs have anything to do with your problem. I have a 1300 and it will run with the key turned off. Once the engine is running there is no need for battery power or glow plugs to keep it running. I'd check the fuel system thoroughly.
It sounds like dirt or water in the fuel system. It sounds like the engine is starving for fuel.
We had a Ford NAA once that did something very similar. It would run just fine for about 5 minutes then sputter and die. We played around with the thing off and on for a couple months. We finally found a piece of plastic (Saran Wrap) in the gas tank. It floated to the top with the engine off but as soon as you started the tractor it would get sucked down againts the fuel pick-up.
I don't think the battery or glow plugs have anything to do with your problem. I have a 1300 and it will run with the key turned off. Once the engine is running there is no need for battery power or glow plugs to keep it running. I'd check the fuel system thoroughly.
It sounds like dirt or water in the fuel system. It sounds like the engine is starving for fuel.
We had a Ford NAA once that did something very similar. It would run just fine for about 5 minutes then sputter and die. We played around with the thing off and on for a couple months. We finally found a piece of plastic (Saran Wrap) in the gas tank. It floated to the top with the engine off but as soon as you started the tractor it would get sucked down againts the fuel pick-up.