Share 'help needed le mans wiring'

hi i am almost at the end of my guzzi le mans 2 project which is up and running now but the generator light will not go out i have looked at the wiring on the alternator and there is no wire to the terminal marked D- i only have a haynes manual with a lm 1 wiring diagram does any one know if they are the same. in the diagram D-goes to earth is this correct ? and does anyone have any info on testi…