Having car audio problems!?

So my friends stereo wont work, he thinks its the stereo so he bought a new one and asked me to install it, his car is a 97 honda civic, i have the wiring diagram for the car, so when i hooked up the new radio, it still didn't work. I took it all apart and checked the power wires, there's 2, ones a constant power and the other one is only powered when the key is turned in the ignition, when the key is in ignition there is no voltage. long story short, could there be any other problem or is this the problem, just want to make sure before i go hunting for where the wire is broken, the radio is a JVC kd-g300.
Don't know everything ! the link u provided is a dead like for me any others?
im aware of that, the constant wire is for the memory, that one works its the ignition one for the power that seems to not be working
 
As you know there should two feeds. I suggest that you take second feed from the fuse-box to the radio, The second feed is to turn on the radio and the first feed is for the radio's memory.
 
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