Based off one wire diagram I found, I ran the wire from the bat terminal on the alternator straight to the ammeter and then to the battery out the other side of the gauge. The gauge needle wasn't moving at all and I believe there was no current coming out the other side going to the battery. I bypassed the ammeter and ran that wire straight to the battery and after running for a couple minutes, I shut the tractor off and it started back up without jumper cables. I bought a new ammeter tonight and will install it another day.
I would like to put together a correct diagram for those with TO20s running a 3 wire alternator and 12v coil with an ammeter and charge light. I'm attaching a diagram that I will correct as I'm given advice. Please look at it and tell me what is wrong with it as is. Then please tell me where to put the ammeter and the charge indicator light. Maybe we can get a good one to post.
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