250-500cc Wr 360 Wiring

Hello guys, i got a wr360 99, there is 3cable from the alternator light blue, blue and yellow. The yellow has to be my cable for the lighting if i'm correct. The problem is i can't measure any power in the yellow cable but i got another cable coming from the CDI that's a white cable and in this one i can measure 30-50V with the engine running. How is it possible what can i do with it? I checked my alternator everything looks great. My lamps works but only can measure around 3V what i really can understand! Every help appreciated!

are those voltage readings at an idle?

30v on idle and around 50 if i rev it, at the headlamp it's always around 3-4V. But what i didnt really understand is if i unplug the regulator and measure the green/black wires it's nothing, the yellow from the alternator is the same 0V. Only on the white cable i got 30-50V

The alternator looks good, wiring is ok, but i got power on a white cable not in the yellow one. I have no idea why

Yellow to the voltage regulator, then yellow & blue to lights