Hi Guys I need help. I am at my wits end. I had a audio installer install a Pioneer head unit in my Dodge Durango (2006, HEMI limited). After a few years this unit is starting interfere with the car's electronics; so I have pulled it out. I am trying to re-install the original head unit (alpine, I think).

But this is where the problems started. The installer did not use a wiring harness, he cut the wires on the factory wiring harness. I have purchased a new factory harness from Metra but I am having some trouble figuring out how to wire it up.
I have a few question that maybe someone knowledgeable can help me with..
1) How do I know if this system has an amp?
2) the attached picture show the pin connection but they do not put any sound on the speakers, does anybody know which ones they should be?