Hi
Had the same problem, took the path of speaking to seller, (seems to know his stuff) Guys name was james.
What the company has done is made a coil with an extra earth, not only allowing the bike to earth through the body of the coil but also via an extra wire. I understand why he has done this becouse this is what usually causes failure.
HOWEVER
They assumed we all had a high level of mechanical knowledge and didnt think to give any idea of fitting instructions. They have promised they will from now on (whether it happens or not is another thing).
This is all you need to do.
The orginial wire on your bike goes to LEFT, AS YOU LOOK DOWN AT FIXING BOLT.
The terminal above fixing bolt can be ignored of connected to earth.