What color wires go to front and rear speakers respectively

[Roughridercog]

I'm installing a different stereo system and I believe I've identified the positive and negative wires for the front. But what are the colors for the positive and negative wires for the rear speakers in my 89 1500?

Help! My wife wants her side of the garage back.

[Erdeniz Umman]

Here are the diagrams for 89-90 models (black and white) and 93-2000 models (color).
Note that there may be wiring harness differences since the rear speakers were optional on 89 models.