It should drop to just above zero within a few minutes after startup, and kind of bounce around there (as the regulator kicks in and out). If the amperage goes up or down with RPMs, and never drops back, you've probably got a bad regulator. To test, take the regulator out of the circuit by grounding the Field (either at the generator or the regulator), and put a jumper wire between the Bat and Gen (or Arm) terminals on the regulator- if the ammeter just goes higher and lower based on RPMs, the regulator is not working.
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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