Bad Regulator?

[zombie]

A resistance test is different from a diode leak test. You need a multi meter that has a specific diode tester. I don't know any other way to test them. Have you tried it on the scoot?
The only other issue is if the stator is Not emitting ac volts or the engine/chassis gnd is bad. On an ac range of 200 you should be at or near 110vac from the only two stator wires going to the rectifier.
You will have two ac wires in, one gnd, and one +12V out. Thats all their is.

[jstluise]

No luck with the new regulator; still acts the same at the original and the first replacement.

I did put my DMM on the diode check function and test for the forward voltage drop of the diode.  I could only get one reading on a particular pair of pins, but the readings matched between the replacement regulator I got.  For the original regulator, the drop was a little higher, but not by much.

I measured the charging coil and lighting coil resistances of the stator again.  For the charging coil (white wire), I got around 1.2-1.4 ohms (spec is 0.2-1.2 ohms @ 20C).  It is a colder than 20C here, so maybe that affects the reading.  Not sure if 0.2 ohm above the spec is bad or not.  Got about the same difference for the lighting coil (yellow wire).

I removed the regulator and checked the VAC from the charging coil and lighting coil.  At idle, the lighting coil (yellow wire) had about 18 VAC on it, the charging coil (white wire) had about 22 VAC on it.  At higher RPM, the VAC increased.  Oh, and in the process I blew out my tail light because of the high voltage. 

With one of the replacement regulators installed, I checked the VAC on the yellow wire.  It stayed steady at about 8 VAC at any RPM.  Not sure if that tells us anything.

Any other tests or check you can think of doing, Zombie?  I'm at a loss.

[zombie]

I am NOT positive but I think the idle voltage should be approx. 100+vac, and the running voltage should be 180+vac. Have you tried dismounting the stator to check for proper grounds? Same for the engine to frame/battery ground?
At the risk of being an idiot... what was the initial problem?

[zombie]

Ok I went back... You have crazy high voltage but no amperage... It's GOT to be a wire burnt Inside the insulator/terminal crimped onto an insulator, and not the wire or something similar. Maybe a bad ground as above. I'm sorry to see this is going on sooooo long. It HAS to be bad wiring.