Yes, that is a voltage regulator. It is in the system to knock
off the high voltage peaks in the AC current wave.
If I remember it is attached to one of the yellow wires in the
harness, and grounded to the frame with the black wire.
There is no power wire exiting from the regulator. It is more
of a ballast/buffer in the system.
It has been years since I have worked on any of my GG electrical
systems, so I an hesitant to make and suggestions.
My feeble guess is the white wire runs the CDI loop and the Yellow
runs the headlight / running light / horn, etc..etc... Depending on
if your bike is an XC or an EC it will power the brake and turn lights.
Sorry I can not be more specific.
JJ
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