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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