These four wires are the lifelines of your stereo. Without them, the unit is a paperweight.
Supplies power to a motorized antenna only when the radio tuner is in use. Orange (Illumination): Alpine Cde 121 Wiring Diagram
After connecting these wires, the most common mistake is swapping positive and negative on one speaker while leaving the others correct. To check for this: These four wires are the lifelines of your stereo