ok so i found the constant power and the grd but i am no finding the acc power wire in my car... and i would prefer not tearing up the dash just to have my stereo turn on and off with the key

details
brand new JVC HD sat Radio
new schoshe wire harness adapter
...
the acc wire on the harness has no power i used my volt meter got nothing

any help before noon tomarrow would be great if you dont know the wire ... where can i tap this wire so it powers on with the key?