@kiwa my solution at work (where i have to maintain a two-digit number of different supplies) is to use shrink tube color codes
Green Positive Center
Violet Negative Center
White AC
Then short rings farther behind the plug for voltage
Blue 3,3V
Red 5V
Yellow 12V
White 19V
Comments
Green Positive Center
Violet Negative Center
White AC
Then short rings farther behind the plug for voltage
Blue 3,3V
Red 5V
Yellow 12V
White 19V