I only checked the yellow wire.

Can anyone answer this riddle. I am having headlight issues myself. I have a 2008 Vento Zip "Li" Two stroke. I turn key on. Start scooter: horn works, blinkers work. tail light works. Head light do not work or side, daytime running lights. What does work, is, when i flicker the bright headlight by pushing down.
What i have done so far to check problems:
1. clean the contacts in the right housing by throttle
2. Replaced main head light bulb and both day time running light bulbs.
3. Diagnosed wires from lights. they are good.

What i am not sure about is when i move the switch position for headlight, daytime running lights and in off position and nothing happened. When the motor is running the lights on the dash used to go brighter when i gave more throttle.

Could it be: a stator, contacts in right housing gone bad, Regulator/rectifier?

Please HELP!!!

This was a great thread to read. An interesting and common problem, some really good tech advice, great diagrams, and a little drama. I hope you will let us know what the problem turned out to be when you finally find it. I am confident from your comments that you have the ability and persistence to do it.

Finaljudgement

I am having a cimilar problem, well not really, but I am not getting spark to my spark plug, on my gy6 150cc. We replaced the cdi box. Went over the wires and found nothing really wrong with any of them, it turns over, and all the lights work. The alarm works as well, just no spark, any ideas?

This link should help..I posted it in 2 other forums and it has been helpful to many.:D http://49ccscoot.proboards.com/threa...park-condtions

To the original poster of this thread...it sounds as if you have a short..where a hot wire is going to ground..:tup:

gee sometimes you need to start at a common base line .

John