Going to install a new head unit in my 01 cobra bought the metra 70-5701 it comes with the 3 plugs the main one is straight forward and simple... but can't find anything on the 2 black/white grounds on the amp/rca plug. Anyone?? My guess is you take those 2 black/white amp grounds and connect to the ground wire from the new stereo and the new metra adapter so that would be a total of 4 grounds all connected.