After reading through this whole thread, I'm thinking you may want to get someone to take a look at what is going on to see if they may be able to guide you along with this project.
Everyone has givin' their all here to try and solve the trouble with the tractor. I myself think your just chasing one thing after another without getting anything accomplished.
Your thinking it may be the ARC, then the S.G. YOU should get one problem isolated and fixed then move onto another if need be.
Good luck with you adventure.
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