Following my rns-e problems, I've stuck my Concert II back in. However, I noticed that the car loom has a 20 pin black male connector and my quadlock convertor for the rns-e has a red 20 pin female connector. They mate perfectly.
My silly question is:-"Do I plug them in?"
I ask because over the years, I've fitted hundreds of stereos but never, ever connected non-matching colours together!