The rear loom wiring colours are:
- Green -> Red - Reverse (not used!)
- Green/Red -> Green - LH Indicator
- Red/Black -> White - Tailights
- Green/White -> Yellow - RH Indicator
- White/Green -> Brown - Fog
- Purple/Green -> Blue - Brake
One day all the colours will follow some convention...
Unfortunately using a 2nd hand extended bike loom has its penalties :-(