I don't have a tao tao diagram. But there are lots of other 110cc diagrams out there. Tao tao's are generic as far as I know, which means they use OEM parts bought from outside vendors which are generic and standard. Thus, there are only a few ways they can be wired up.
I don't think you will be successful in finding an exact wiring diagram for your quad - but if you are please post what you find here...
If you take one system at a time (starting, spark generation, battery charging, lighting, etc.), and with a few measurements with a meter, figure out which scheme each system uses and fix it - one system at a time.
So what works? What doesn't?