Okay, that is understood that:
1. Engine starts and runs normally, therefore brake light switches are either working or bypassed/stuck closed.
2. Tail light (dim) works, brake light (bright) does not, therefore the possibilities are:
a. Fuse blown (other functions will not work that are on that fuse..check fuse list)
b. LED "bulb" defective
c. Light socket defective
d. wires to light socket defective (power or ground)
Ok man, I've just figured out this:
Downloaded wiring of Visar 125, saw that the stop light has 3 connectors (green, brown and green/yellow).
I've unplugged the socket and, with a voltmeter, saw that it seems that in the green/yellow cable (I think is the positive +) when I try with the brown one (I think is the negative -) it always has 12v. So is it "stuck" on the stop bright light instead of brake?
I post the rear wiring, can you help me and tell me if the brown is the negative and green and green/yellow the positive? In that way I can check if in the connector it is always current that makes it "stuck" on brake light.
I cannot figure out how to disconnect the rear cable wiring of brake, but maybe I will try today, maybe it is open all time and need to be changed..
Checked all fuses, perfects.
Wiring seems good..
So, it seems, that it is "stuck" on stop LED light.
The bike works perfectly, engine, winkers, headlamp, tail light.. the only problem is the brake/position.
Here is the full wiring of Visar 125:
https://kymco.it/media/schede/allegati/VISAR%20125%20CBS/impianto.pdfSorry for mistakes, I'm italian!