You need three things to make this system to charge. 1) Stator output between 24 and 30 volts AC checked across the wires from the stator.
2) The regulator/rectifier has to be well grounded. The engine has to be grounded to the frame as well. ( Had one giving me fits until I found a bad engine ground strap.)
3) Battery voltage at the middle terminal on the voltage regulator. One volt lower than the battery is the max for it to work.
You did not tell us what the motor is being used on. I am most familiar with them on the older JD lawn tractors. The biggest cause of charging trouble was either the key switch being bad or the plug on the back of it corroded where the voltage regulator did not get battery voltage.
I worked on these things for many years I only saw maybe one or two bad stators. Never had a flywheel bad. Switches where the most common issue and then regulators after them.
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Today's Featured Article - A 1937 John Deere Unstuck - by Gary Hickman. Here is my story of how I got the pistons out of a 1937 JD B that the engine had been stuck for about 14 years: About 12 years ago my Dad gave me one of the tractors I ran as I was growing up on our farm in central Nebraska. The engine on this tractor, a 1937 John Deere "B", had been stuck for 2 years before he gave it to me. This last spring (1999) I hauled the tractor to our 2 acre lot in St. Libory Nebraska where it joined my antique machinery collection, at that time a 1929 Caterpillar T
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