@Garym, one more try..
-up on your regulator are two connectors, one with 3 yellow cables and one with a red and green cable.
1st test
The one with 3 yellow cables comes from stator and produces AC, measure on this three yellow cables
(motor running, connector together, multimeter on AC)
- one yellow to second yellow
- second yellow to third yellow
- third yellow to first yellow
there should be at each try the same voltage shown on your multimeter. If there is one failing, then your stator is demaged.
2nd test
- measure on this second connector with red and green (motor running, connector together, multimeter on DC 20 V)
-there should be during idle an output of 13.5-14.5V on your multimeter, if below 13.0V or over 15V, your regulator is out of service.
-regulator gets pretty warm during idling, that is normal.