Hi i have just bought a cheap Yamaha DT100 for field use, i have rebuilt most of the bike except the electrics.  I have had the flywheel off, there appears to be 3 coils under it, 2 with 2 wires, and one with just one black wire.  Could someone explain what they are each for? Do any of them produce a current to power a light? 
 
I just want a basic setup, to allow the engine to run, and a kill switch, i also have a CDI box for it, and the coil. Bascailly i need to know which wires from the engine, connect to where on the cdi/coil. 
 
Thanks alot. 
 
Darren