I haven't used my harness since the day I bought the car, but If I can remember right, the heavier guage blue wire is ignition, you have to ground to the chassis, the constant 12v I believe is black with a white stipe(but please don't quote me onthat one), illumination is green with a white stripe. You should be able to either use a tone generator, a d battery, or the outputs from the radio to test for speakers.
