Sub doesnt kick on when put cd in only comes on when turn on radi
I had the same problem, but in my case it was a factory amp.
The blue wire on the deck harness is for a power antenna, and only powers up when the tuner is in use, not in the cd or aux mode. Therefore if you are using the blue wire (on the adapter or car side) to power the remote power on your amp, you would need to connect that blue wire (on the adapter or car side) to a keyed power source. This way the keyed source supplies power when the key is on, and will not cut out when the mode is changed from "Tuner" to "CD" or "AUX".
I just connected to the keyed source on my radio harness, but then, I am not running any kind of system, just the basics.