tl, good question, when I was a used tractor dealer back in the day I saw many ammeters act that way, there's a ton of possible reasons.
1) Ammeter is showing its age or just faulty,,,,,,,,,,genny brushes may be worn or there excess carbon (or oil) on the commutator or the brush hold down springs are weak or the commutator insulator segments need undercut (more apt to cause poor charging but had to throw it in),,,,,,,,,,,,,Voltage regulator contacts may be coated or be burned or carboned or its just not perfect matched to the system,,,,,,,,,theres a loose resistive ground connection,,,,,,,,,loose resistive wiring connection,,,,,,,,and a ton more Im forgetting lol.
BOTOTM LINE if the battery is still charging and all else is working I wouldn't worry much, maybe check and clean all grounds and wiring connections. If it ant broke don't fix it lol
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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
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