if you still have your stock harness then just grab the harness adapter and go from there. It will save you a whole load of headache.
Option 2: friend yourself a 9 volt battery. if you have matching wire (colour) then touch 1 to positive and 1 to negative... the speaker that you hear a pop from obviously belongs to those wires. How do it again and observe whether or not the speaker moves forward or backwards with you do this.
if the speaker moves forward, you're golden and have found your pos and neg
if the speaker moves backwards you just have to reverse the polarity
EIA colour codes to help you out with MOST aftermarket harnesses
Grey: front right +
grey/black: front right -
White: Front left +
White/black: Front left -
Purple: Rear Right +
Purple/black: Rear Right -
Green: Rear left +
Green/black: Rear left -
Yellow: 12v constant power
Red: 12v acc wire
Black: Chassis ground. DO NOT use original ground in your stock harness. Find a new chassis ground that is someone isoloated from other accesories in the car. This is done for power handling Capabilities as well as to reduce induced noise that comes from the stock ground.
Hope this helps you out a little.
you can also try google to find the exact colour code.. but I would never go on that at all. your best friend for doing any wiring job is a DMM. Please invest in one
Also test lights = garbage and draw more then enough current to fry the ecu or deploy airbags...
if you have one... THROW IT OUT