Smiley32 said:
Why the manual say to put the multimeter on AC 20v to test
I don't know, but I didn't measure my AC voltages in my diagnosis.
(I assume you read my blog post on that in case not:
http://cjeastwd.blogspot.com/2012/09/my ... tator.html
http://cjeastwd.blogspot.com/2012/10/t- ... tails.html )
Linked was this page
http://www.jetav8r.com/Vision/Stator/Stator.html
A significant point mentioned in that is:
The stator A.C. output voltage varies with engine RPM. The more RPM the more voltage. So, the stator output must be "Regulated" to provide 12-15 volts into the bike system. The raw A.C. output from each circuit is about 50volts ac at medium RPM
So I suggest that you get an assistant (or clamp probes) and look CAREFULLY at exactly the V at different RPM (you need to take a measurement (arbitrarily calling each red wire A B and C)
*A-B
*A-C
*B-C
to measure all coils in their full length.
(edit) Indeed re-reading that link I gave above it says:
* Output after regulator box should be 14.5 volts DC engine running no load
* Each stator wire should have continuity with the others (0.32 ohms by the book).
* No stator wire should have continuity with ground (short or bad insulation)
* Engine running, each set of stator wires (1-2,2-3,1-3) should produce 50v AC.
If any coils is shorted to another you will see perhaps only a few V difference, so its important to write it down or speak it out during your phone recording AND the RPM ... be structured ... 2000 RPM then 3000, 4000 and then 5000
I still think that the test lamp to check for any insulation bleed between the coils is a good test for any potential leak to ground, however it won't show that up between coils. I would caution putting 12V DC across each of the stator windings (the three white wire phases) because it won't actually help.
Given your charging situation sounds almost identical to mine and mine was a stator in the end I'm leaning towards that being the solution. I did the work myself but the part was about AU$500.
hope to read your results soon
Best Wishes
(and a PS about me. I'm actually an electronics engineer who began in electronics as a technician, so I have some diagnostic abilities even if I spent 90% of my time around micro-processors)