Illumination wire?

I found a couple OLD threads saying how orange is the illumination wire (and the wire PHYSICALLY is labeled "illumination")... Which is the wire I used on my Kenwood 7019 and now my Alpine iDA-X001... but both do not respond to the dimming of the lights.

I did notice there are also two cables labeled "illumination +" and "illumination -" and I think they were orange/white and orange/black? I'd have to double check to make sure of the colors.

However, I think I am using the right wire, the solid orange that is labeled illumination. Neither head unit responded to the dimming. Am I mixed up? 99 GT.

Well that would certainly explain it. However, it didn't seem to do anything on either head unit when I would turn the lights on. I had dimmer enabled on both (The iDA-X001 even has 3 levels of dimming) but nothing happens, lights on or off.

Thanks for the info though, that does help explain some confusion.