I have an 05 monte LS and the radio powers up but no sound comes out.. replaced the speakers and amp but still no sound.. would this be a wiring issue then. if so how do i go about fixing?

 

the speaker "outs" from the factory head unit are on a separate wire connector on the back, it might be unplugged. if you still get the warning tones through the left door speaker then it is still plugged in. if there is no tones pull the dash plate off and pull out the deck and see if its unplugged.

 

it is still plugged in. dealer said it could be wire harness. anyone know how to grab a new one?

 

I'd need to know what your setup consists of in order to help you. How did this problem come about? Did you just get the car and it came with this problem? Did you recently replace a component and all of a sudden start having this problem? Need more info man.

If I were you I'd do some troubleshooting before going and throwing more money at it and hope that takes care of the problem. Try to figure out what the problem is first then spend money to fix it, you're already guessed by replacing the speakers and amp and that didn't work out too well. Answer my questions above and I'll help you out