This is a Honda clone more or less, right?
The 1981 and newer Honda Cb125 has a 5 wire system, you have a ground, one going to the ignition switch, two that go to the voltage regulator and one that goes to the head light (giving the head light 12v AC?), some of the other wiring diagrams show a "spare" wire that goes no where.
As to tell what goes where I'm not really sure, I would set the new and the old side by side and hope that they are close enough that you can tell, or ask the seller.
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