Motoplat wiring question

I just bought a Motoplat stator online, and it has 3 wires coming out of it: Blue, Yellow & Black. What is the connection for each of these. I would assume that Yellow is lighting, right? Thanks!

yes, Yellow is lighting,,did you get the flywheel as well? thay are a matched set.

Yes sir, I got a set. I think, however, the set I have is for a smaller shaft size than what my engine has, so I may have to re-sell it. Ive hooked the yellow and black to a small LED and barely turned the flywheel over the stator and the LED flickered super bright, so at least that part is good.

For future reference, what is the purpose of the other two wires: Blue and Black. I figure they must go to the coil, but if thats the case, how was I able to use the black as a ground in my LED test. The coil needs two wires. Perhaps I just got lucky on it working as a ground. The stator is supposed to ground to the base isnt it?