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First confirm those #s with a different DMM. If they are accurate, turn scooter off, clean battery cables and posts, check for corrosion on stator harness to chassis and or regulator. If no corrosion, disconnect stator to chassis connector, set DMM to ACv, check output at each yellow wire from stator to ground with engine running. Each phase should be the same. If OK, check DCv output from regulator, if OK, substitute a known good battery and retest.
Anything that fails the testing through the diagnostic steps, replace with known good.
Nominal output charging voltage @ 2k to 3k steady rpm should be 13.1 DCv or better.
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