Hello! My jd 3020 Diesel tractor won’t turn over. Brand new batteries (I checked to make sure they’re good) cleaned all the terminals. The push button won’t do a thing. Tried to jump the starter, nothing until I beat on the starter a bit then got a little sound for a second. Then nothing, beat on it a bit and a little something again then nothing. Lights working, any ideas? Bad starter? Any trick to tell if I need new wires that go to the battery (don’t know what they’re called) and already replaced the battery terminals.. just not the big wires that go to the terminals. But I cleaned them Really well with wire brush. Any tips would be much appreciated. It’s the second John Deere ( the other is a 40/10I have sitting with the exact same problem. Just stuck. Maybe a switch, safety switch? Also it started fine when I parked it. Thank you!