I have the stock radio that came with the car. The amp (infinity mr472783) is blown. So now i have no sound coming from the radio. I removed the passenger seat and removed the amp. How can i rewire the radio to the speakers without the amp if possible??

 

Unfortunately unless you can find a wiring diagram for the amp you will probably have to pull the door panels/speakers and see what color wires go to each one and match those up with the wires at the amp.

You can then use the guide at the link below to match up the radio wires with the speaker wires.
http://www.installdr.com/harnesses/dcp-wiring.pdf

I have used a factory Chrysler radio from a 2001 Sebring with an Infinity system in an old 89 Dodge Ram and got good sound so you should be ok with bypassing the amp once you figure out the wires.

Honestly though, unless you have a specific reason other than cost, I would recommend going to a place like Pull-a-Part ($17.50 for an amp) and just getting a replacement amp and save yourself the hassle.