Originally Posted by LynnEdwards

There are a lot about four pin rectifier/regulators that I don't understand. I've taken apart three of them, and they are all different inside. Even worse, they are wired up differently externally, and not compatible with each other. All three use the same four pin connector as shown in your picture.

Of the three this one most closely resembles yours in that it is advertised as being a replacement for 110cc machines only. The other two were advertized as being compatible with 150cc/110cc machines.

The connector is shown looking into the regulator as in your picture. Note it's wired differently than the picture you put up. And to make it even more confusing, this regulator cannot work with almost all the wiring diagrams for 110cc machines I've seen. So either the wiring diagrams are all wrong, or there is yet a fourth version of 110cc regulators. I don't have a 110cc machine to play with so I don't have any way to resolve these discrepancies.

On your new regulator are pins 2 and 4 shorted together?

If you start up the bike (you can do this with the regulator disconnected), what is the AC voltage between the White and Yellow wires at idle. Then what is the ACvoltage from both White and Yellow to engine ground?