Yesterday I was faced with the challenge of replacing the stock radio in my vehicle. The stock radio had broken, and it was time for a new one. As it is, building the proper wiring harness is already not easy... better pull out your wire stripers and electrical tape. But to make the challenge even harder, they colour coded everything (including the use of blue, purple, and violet). This did not make it easy for me! I am colourblind myself and rarely can differentiate blue vs. purple and purple vs. violet. In fact, for most of my childhood I actually believed violet was simply just a different name for purple.
To overcome this, I pulled out an app for my Android phone that allowed me to differentiate colours using the camera, and the project ended up OK... but had I not had this app, there would have been a very good chance my rear left speaker would have become my FM radio antenna.
So after yesterday's quite frustrating experience, I feel colour coding is not the answer for labelling wires in a wiring system. So the question is:
How can wiring systems be designed to not rely solely on colour?