Audio Systems: Need some help, stereo wiring diagram, cigarette lighter

Question
Okay so I need some help on this one. I am trying to hook up an amp and subs to a 2002 ford taurus whit a factory deck. I have bought a line output converter an have ran that to the factory amp in the trunk. My remote wire from the amp is ran to my cigarette lighter wire which works fine. The amp turns on and all. No complaints there. My problem is that I was told to tap into the rear speaker wires which I have no clue how to do. I don't want to run eaker wires from the amp to those speakers for fear of blowing them. Now on the factory amp there are to plug ins with wiring coming out of them. Both plug ins have nine wires, the same amount on my output converter. I tapped into one of them and I can feel a slight vibration in my subs yet no power. Everything else is hooked up properly. Is there something I am missing here? I have been trying to get this together for about six months now and have yet to do so. So as much help as possible would be greatly appreciated.

Answer
Go to this page:

http://www.modifiedlife.com/2002-ford-taurus-car-radio-stereo-wiring-diagram/

where you can learn the wire colors.   The rear speakers are
Left Rear Speaker Positive Wire (+): Gray/Blue
Left Rear Speaker Negative Wire (-): Brown/Yellow
Right Rear Speaker Positive Wire (+): Black/Violet
Right Rear Speaker Negative Wire (-): Orange/Violet

according to the information presented.

Now you know which wires to look for.....

That's it?  Let me know if there is more.