I have not specifically used that harness brand (yet) but I am also fairly confident there is a manual with wire colors identified.
No way id even start that without having all the wires identified first. That's asking for trouble.
If you cant find it you can call them, I have spoken with their tech support a few times. It may have been a longish hold but they had good info.
Not sure which harness you have but this is for harness numbers 10101-10104:
https://www.painlessperformance.com/Manuals/10104.pdf
There should 100% be a detailed guide available.
Also some mfg's do have small print on the wires (not trying to insult you), maybe double check down the wire too.