OK - the backward reading ammeter with the battery connected negative ground says the ammeter is still wired for positive ground. Most likely is the coil is too.
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I can almost guarantee the voltage regulator is fried. Recommend replacing it with a new one. Then reconnect the battery for positive ground and polarize the generator. Finally start it up and see if it charges.
If it does, it's time to celebrate(!)
But if it does not, walk thru the generator/regulator troubleshooting chart on my next post below. It will help you isolate the cause of the "no charge" condition.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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