Got The Metra Harness?

Now what? I got everything out and i cant figure out which plugs (factory wiring ) Go into the Metra Harness. I was tring the plugs from the stock radio, when i do get them plugged in my aftermarket H/U wont come on....What the HE** am i doing wrong....

Edit...This is the Harness i have Parts Express:Metra 70-5519 Ford 2000-2001 Amplifier Integrator Plug

Is this the one for my 98GT. I have the radio & cd player seperate Mach 460?

Seek and Yea shall find....I got it figured out! I got the wrong harness. I need Metra 70 5511...