First of all, your ammeter is wired backwards. REVERSE the leads.
Secondly, if the alternator is fairly new, obviously, someone didn't wire it up right. If you have a ONE WIRE ALTERNATOR - the single lead goes to the SOURCE SIDE OF THE AMMETER.
Is the tractor wired for positive or negative ground? With the alternator, people usually run these negative ground. THUS, the coil wires should be REVERSED.
Lastly, an engine that kills itself for no apparent reason after running fine for a while indicates a condenser problem. Replace condenser. (Either that - OR you have a FUEL PROBLEM, which would be that the carb is running out of gas at higher rpms - to fix, clean tank, replace sediment bowl strainer, and make sure carb has a steady flow of fuel)
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
... [Read Article]
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