Audio Systems: 1999 cherokee, wiring harness, first test

Question
I installed my jvc head unit with a new harness and everything comes on but I am not getting any sound. I rechecked all of the connections 3 times.


Answer
If you check very close to the wiring harness and the vehicle harness they are the same but there is one wire in the harness that it is not in the  new plug
that is the power for the infinity amplifier, cut it from the harness and use the blue wire from the radio
if there is 2 cables  first test then with power from the ignition until it turns on, and once you find the cable use the blue wire to turn on the amplifier