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jjwwrr, My 1939 9N has a key switch for the ignition and a starter button on the left side of the dash. The tractor normally is a positive ground and the negative side of the battery has the large battery cable running to one of the terminals on the large push button switch mounted in the dash.
From the other side of the large push button switch there is a large cable that runs to the starter terminal.
If this is the way yours is set up, you can use a set of jumper cables and just using one of the cables, jumper from the negative side of the battery down to the starter terminal.
If your starter will turn, then it is either the connections in the battery cables or a bad push button switch.
To check the push button switch, (use just an old screw driver or something that you don't care gets burned a little because you will get a pretty good spark) jumper the 2 terminals on the back of the big push button switch. By shorting these 2 terminal, you are bypassing the switch and making a direct connection.
If your starter starts to turn, then your switch is bad or the connections to it are bad. If....someone has changed the battery and has the "ground to the frame" hooked to the negative side of the battery, all the proceedures are the same as above..... ...but there are other reasons that the positive side of the battery should be the ground, and you can worry about that later if that be the case. Above all....make damned sure your tractor is in neutral and the wheels blocked, before you try any of this. If your ignition and push button are a different set up than this..... .....then ignore this message ! G'day mate !
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