just got a 07 mustang and when I bought it apparently the previous owner took out the factory stereo and put in a cd player. But when I turn the volume up or put in a cd in I can c thats it working but I'm not getting any sound out the speakers? Does anyone know y?

 

Even with a harness, people don't realize you have to connect the remote wire from the harness to the blue wire in your cars. I bet if you looked I'm right. But then again maybe I'm wrong.

Good luck!!

 

Either this, or you have a speaker wire grounded somewhere