The terminal marked R on both coils goes to the contact breaker via a red wire on the RH coil and a green wire on the LH coil and so to earth. R therefore equals minus. The other terminal is positive and the RH coil is fed from the ignition switch via the handlebar kill switch via a white wire. The LH coil is fed from the RH coil via a blue/black wire.
This is an extract from my own wiring diagram, see here for more details
I hope this helps. Best wishes Chris