i installed a sony cd player in my 91 rx7 coupe it works but how do i get the power antenna to go up and down

 

there should be a wire for it
the thick black one that plugs in the back and has a silver tip (i think thats what it is)
then to SUPPLY POWER to it....you gotta make sure to connect the wire for it from your old harness to the new one (i think the new decks usually have it as blue w/ a white stripe or somethin)

 

the fc has a negative power antenna trigger, and your new sony has a positive output(blue/white wire) you will need to use a relay to switch the blue/white to a negative output.

 

where could i get the relay at