So i just installed a new head unit (JVC KD-HDR50). I had a (Sony Xplod CDXGT520). i noticed that the plug in for the sony fit inside the back of the JVC so i just used that plug in. Everything works great but im not getting power to my amp. I grabbed my voltmeter and checked the amp its got power to the 12v the ground is solid but there is no power going to the blue wire at the amp. IS there supposed to be or not. There are no fuses for the blue wire it runs from the head unit direct to the back and then to the amp. I checked all of the fuses amp has 2 those are good and the main fuse under hood is good and has power. What did i do wrong? did i need to use the wires that came with the JVC even though everything works great>
thanks for you help guys.