The only thing I want to know is: why the empeg's power antenna & amp remote wires (ouput line) go back to the ISO power connector, which normaly receive power from the car, and not from the empeg??? In which goal is it for?

If the car has a stock amplifier controlled by the HU, it is probably wired in the same connector/harness as everything else...

Also, once you've wired up the ISO connector part that 'belongs' to the car, you can pull everything at once (ignoring speakers and/or RCAs). I removed the extra 12V lead from the VW ISO connector (removed contact from connector, isolated with shrink tubing and taped back along the wiring loom). I then stole another (unused) lead/contact from another connector I had around and put that into the connector and connected that to the wire going to my amp.

If I ever want to revert to stock VW layout I just remove that contact and reinsert the taped back 12V lead, and switch back the switched and constant 12V feeds.

/Michael