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 - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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