Well on the fuse box on my S5 Vert the black wire with the white stripe goes to the side facing the strut tower on the top bolt (might be the only bolt there on that side). The other solid black wire faces the front of the car connected to the bottom bolt.
As for that ground I was looking and saw that I have one that looks like that and it bolts to the back side of the strut tower right next to the trailing coil pack.
