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Guess it's a little late now but I thought I'd post what I've found for anyone looking in the future.
I went and traced where everything ends. The wires are distributed and change colors between the amp harness and the speakers.
Pin#1. front right input -
2. front right input +
3. rear left input -
4. rear right input -
5. rear left input +
6. rear right input +
7. na
8. amp turn on signal
9. 12v power ground
10. front left input -
11. rear right deck speaker -
12. rear left deck speaker -
13. front left door +
14. front right door -
15. rear left door -
16. na
17. rear right door -
18. front left input +
19. rear right deck speaker +
20. rear left deck speaker +
21. front left door -
22. front right door +
23. rear left door +
24. na
25. rear right door +
26. 12v power +
This pinout is for a 1997 C36. The amp is model number 2028202789.
For whatever reason the two front left door speaker wires seem reversed compared to the other speaker out pairs on the connector. Could be a factory defect on my unit though. For reference solid green is front left door + and brown with green stripe is front left door -.