Now I have this Polo 6C, and I need to get a wire to the earth connection 347 ( roof wiring harness ). I'm a bit confused, where do I find this ? Obviously in the roof wiring harness but... how do I connect it after I find it ? Is it like .. a wire ? Since I only know about studs. Look at the following schema:

I need to conenct my 2nd slot wire from the Rain Light Sensor to the 347 earth point ... any clues ? Any picture of a similar situation would be great ...
