I suspect this may be a stupid question but -- I have taken the Audio 20 out and it has 2 antenna connections (1 yellow and 1 black). The new comand unit has 3 connections 1 yellow, 1 black and 1 blue. The yellow is straight forward, but as the Comand antenna is also black which do I connect to which? Does the original black connection still go to black and the gps connection to blue? or do I need an adapter to join both blacks and connect them to the black ignoring the blue?