havin’funfarming - 9/7/2024 10:19

That sounds oddly familiar to what I have happen sporadically on a NH T9.645 I have. It has a 24 volt circuit for the starter and every once in a while when I go to start it the starter will just make one click every time I turn the key. All I have to do to start it is put a small jumper pack on the big 12 volt terminals, which I assume are meant for boosting, and it fires right up like I have fresh batteries in it. I don’t know enough about how that system works but it makes sense that it is raising the voltage enough for a computer to allow it to crank like ccjersey said. That little booster pack shouldn’t be able to start the tractor so easily if the batteries were actually dead.