Zeners. Rotor suppprts its weight. Original wires. Battery is 3 years old but has it tested as good. 25k volts out of the statorStill on zeners or a modern rectifier/regulator? how old is the wiring? rotor still got its magnetism? should be able to support its weight when hung from a large steel spanner. battery good? More info needed
11.5At Idle?
What RPM?
25kWhat is the AC voltage with the wires unhooked from the system, engine revving 2,000?
If the test was Volts alone then its not a test, batteries with internal high resistance will show good volts but not take a charge. You need to do a load test. I have had new batteries fail a load test.Battery is 3 years old but has it tested as good.