Take it to a local shop....

A speaker lead has both positive and negative....

From your post, it sounds like you are putting hte negative speaker wire to ground, or trying to put it in the harness somewhere.

I think you are probably missing the wiring harness for the car-to-radio.

The 9 pin harness in the car was designed for the stock radio...not the aftermarket one you have (with 13 pins)

John