I have a 2004 Ram 1500 with the 5.7, with the infitiny sound system. I have 3 tweeters and 2 front and 2 back speakers in the doors. I wanted to replace the stock headunit with a aftermarket one. So I went and bought a headunit and the adapter for my stock harness. The head unit turns on but no sound comes through my speakers. But if I hook the old headunit back up it works perfectly fine. Anyone have any insite on why this is happening??

Did you buy from crutchfield? They would supply you with everything you need to make it work.

no I bought my head unit from Walmart, the adapters I bought are scosche and from what I was reading it said it would work.

I have them all connected. The wire was labeled “amp power” and I connected it to the corresponding wire on the new radio harness. I’m starting to feel like it’s sometjinf to do with the infinity amp.

here is the diagram of the stock head unit.

What wiring harness did you use? If it was metra 6502 then that is the problem.
Metra and scosche also have tech support lines that are helpful.