Both.I am not sure if the earth wire needs to go to #9 on the VDF or the S.
Yes, you should connect the ground to the spindle somewhere. Doing it through the 4th pin in the plug is the neatest way to do it.Last but not least there are tons of variation on the internet and some event mention opening my spindle and making sure the ground wire is shorted to the spindle body since it is not from the factory... ????*??