Audio Systems: Taurus Sho radio trouble, ford taurus, static problems

Question
Is it possible to tell which amp is which and yes i did get the radio from a junk yard but i also have a aftermarker radio that i hooked up and it still did the same thing (i did hook up the blue wire with white stripe for amp) I am not a pro at this car sound stuff but i know a little, so if this is a wire problem should i just take it to a professional or would recommend taking care of it myself.
-------------------------------------------
The text above is a follow-up to ...

-----Question-----
I have a 95 ford taurus sho and i am having a lot of problems with the sound system that i cannot figure out. I have a stock tape/cd player and everytime i try to play the radio or anything i cant hear anything at all. If i turn the volume all the way up i can hear just a tiny bit of music but thats about it. I have changed the head units to see if maybe that was the problem but that wasnt it then i changed the amp in the trunk that didnt do it either. I unplugged both back speakers in the back and i got nothing. I wonder if im doing something wrong or maybe you just know something i dont please help me out this is driving me crazy. Last question behind the back seat there is two amp looking type things i changes the one to the right i was wondering what is the other one to the left is that another amp that maybe needs replacement or is it something completely different.
-----Answer-----
i amplifier is  for all 4 speakers and the other amplifier for the jbl woofer system

but it sound like a wiring problem  or a bad radio
did you get the other radio from a junk yard ?


Answer
we service the radio for the lincoln  it is the jbl with the volume togle up down this is also for the taurus from 1988 to 1993 this radio have tunner and static problems low volume
most of our customer get a radio from the junk yard and they never  work, i have a customer that purchase 5 radios from junk yard and they all have the same problem  
this radios are old and the temperature damage the boards making the capacitors leak inside the same happends to the amplifiers