When you get back from the electrical shop I have a feeling your going to still have to fix your tractor.
Take your battery out for these test.
One of these three is probably bad.
1.Starter selenoid, Four post selenoid, take the two little wires off the selenoid, mark one so you know where they go. Apply pos+ juice to the "I" terminal and ground to the "S" terminal. This can be done strait from your battery with two small jumper wires. The selenoid should make an audible click, it should be ok. I take it the meter you have is a multimeter, you can put this on ohm reading, you know this settin by touching the two leads of your meter together and you should get a reading. To double check your selenoid apply juice to the two small terminals and have your wife hold the meter to the two large post,you might need to take your battery cables off the selenoid to isolate it, when it clicks your wife should see the meter peg over. Selenoid ok. If no reading replace.
2. push button. Use the meter on the same setting and hold one lead on each side of the switch leads, have your wife push the button, your meter should peg over. You might get some reading with the meter with the wires attached and you might have to disconnect them. If the meter pegs the switch is ok if not replace switch.
3. pull switch. Test the same as 2. When in the run position your meter should read, if not replace.From what you've said it would appear that your battery and starter are ok, so these are some of the other components in the start curcuit. To read the scematic, this may help, for a pos+ system with neg- ground start at the batterys pos+ terminal in the scemstic and draw little arrows in the direction away from the battery, this is the way the juice flows. It should go to your selenoid first and stop because the selenoid is a switch. You can jump over the selenoid and draw arrows on down to your starter. You should have a small wire hooked to the same side of the selenoid as you hot battery cable. Draw an arrow on up to your ammeter, the ameter does not stop the juice just reads it then continues out the other side of the ammeter. If you have a terminal block the wire from the ammeter juices this side up for always hot, then draw arrows from all the wires on this side of the block pointing away from the block. Are you getting the ideal of the flow? When it gets to the ign switch ,if this is bad it stops the continuation of the flow. Good Luck hope I didnt confuse you to much.
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