2006 Hyundai Elantra | Stereo Wiring Diagram April 28th, 2013 Posted in Hyundai Elantra. 2006 Hyundai Elantra Stereo Wiring Information. Radio Battery Constant 12v+ Wire: Red. Radio Accessory Switched 12v+ Wire: Yellow. Radio Ground Wire: Black. Radio Illumination Wire: Pink. Left Front Speaker Positive Wire (+): White. Left Front Speaker Negative Wire (-): Brown. 2006 Hyundai Elantra Car Audio Installation Guide Whether your an expert Hyundai Elantra mobile electronics installer, Hyundai Elantra fanatic, or a novice Hyundai Elantra enthusiast with a 2006 Hyundai Elantra, a car stereo wiring diagram can save yourself a lot of time. Automotive wiring in a 2006 Hyundai Elantra vehicles are becoming increasing more difficult to identify due to the installation of more advanced factory oem electronics.