66 Barracuda radio wiring

Thanks !
Where does the cap in the back of the dash connect to ?

Spy cam
Yes I meant green wire ( I changed it, in post).
As long as I have messed with these ole radios, if you have only one speaker, both wires from the radio, go to it (the speaker).
I can't help you with the coil condenser, as my car is all bundled up for the winter, out side. But I can tell you there is a
condenser on the back of the dash, as I have that in my basement. Their is no writing on the condenser on back of dash. I have it all apart at present, to change all gages to after market gages.
barracudadave67