HOW TO ADD A GROUND LOOP ISOLATOR (RETROFIT USB)

Hi ALL

I've made all the modifications and it worked OK, but i have some "alternator whine" in the sound. I've made all the conections soldering and isolating and protecting with covers moldered by heat. I got a Ford Focus parts with all the pins in the connector module so i only had to cut and solder.

¿How can i add the Ground Loop Isolator? thats because the Ground loop isolator only have two wires (red and white) and the wires out from the USB Module to Radio Aux are Three (Pins 23 (Ground),5 and 6). Have i to add the GLI only in the wires from 5 and 6? What happens with the ground wire? Is it directly connected to pin 6 on the C Connector on the radio?

Also i don't have the Track info or any new icon in the Convers+ (Firmware 814). Is it possible to update it by Ford?

Another thing is that the info appears in the Navi (Ipod, USB and Line in) but Bluetooth streaming doesn't appear, even darkened. Is it right or it implies that my Blaupunkt Nx doesn't support that feature?

Thanks for all the info