Stereo wiring diagram - colors?!

My friends has a '91 storm, not sure what model...

Anyway, he had he stereo stolen a while back and when they took it, they just cut it back to the stock stereo wires. So we go to put in another one, and we got a little confused. We could not figure out which one was power (there were two reds...) or ground (two blacks)
Anyone know what wire does what? thanks

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