2000 Ford Focus | Stereo Wiring Diagram 2000 Ford Focus Stereo Wiring Information. Radio Battery Constant 12v+ Wire: Yellow/Green. Radio Accessory Switched 12v+ Wire: Orange/Green. Radio Ground Wire: Black/Green. Radio Illumination Wire: Orange/Black. Left Front Speaker Positive Wire (+): White/Black. Left Front Speaker Negative Wire 2000 Ford Focus Car Radio Wire Color Codes - ModifiedLife Whether your an expert Ford Focus mobile electronics installer, Ford Focus fanatic, or a novice Ford Focus enthusiast with a 2000 Ford Focus, a car stereo wiring diagram can save yourself a lot of time. Automotive wiring in a 2000 Ford Focus vehicles are becoming increasing more difficult to identify due to the installation of more advanced factory oem electronics.