amp not getting loud anymore?

[jstone2020]

All I did was take out my Jvc head unit replace it with my stock head unit and put my pac harness on it using the same rca cables and it works.. I tried using all 3 rca preouts on the Jvc but none worked, I just shipped it off to United radio its under warranty so I'll see what happens

 

[Jeffdachef 5,000+ posts]

you didnt even bother to do proper tests at all, stop wasting money shipping sh*t back and forth when you have no idea whats actually wrong.