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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.pdf


Sorry for mistakes, I'm italian!

Have you checked the LED "bulb" or it's socket?

Yes, the LEDs of stop are working but they not get brighter when I use front or rear brake. Dunno what could it be

Hi, I've a problem with the LEDs of my Visar 125:
When I press fr stop brake or rr stop brake no rear stop LED works. The only thing that works is the position red light but it not get brighter when I brake.
I've watched all cables and fuses and it seems perfect.
What can I do? What do you suggest me to check?

Thanks!

@DrewDc, welcome here too, att. part diagram from EU model, maybe helps.

Thanks, I hopet that I can understand how to remove the cover etc. for both! Really helpful!!!

Hi, I've just bought today a Visar 125 used from a guy.
I've bought it at daytime so I discovered now that 1 bulb of dashboard has burned out.

Can you help me changing it? I just need to know how to open the dashboard (done a lot of time on my old Opel Corsa).

Same for change the H4 bulb (if it will fail.. so I can change)

Thanks, greetings!