Stereo Wiring Diagram Menu. Menu. Request Stereo Diagrams; Stereo Wiring Diagrams; 2004 Ford Focus. July 16, 2012 July 15, 2012 by Mr Stereo. 2004 Ford Focus Stereo Wiring Information. Radio Battery Constant 12v+ Wire: Yellow/Green Radio Accessory Switched 12v+ Wire: Orange/Black Radio Ground Wire: Black/Green. This video demonstrates the Ford Focus Complete Wiring Diagrams and details of the wiring harness. Diagrams for the following systems are included : Radio Wi.
Understanding and interpreting your 2004 Ford Focus stereo wiring diagram is the make or break point of your entire audio system installation. Taking the time to properly decipher and study each component, symbol and connection type is essential for a successful installation. With patience and diligence, your project can be completed with ease.. Right Rear Speaker Negative Wire (-): Gray. 2004-2010 Ford Focus Stereo Wiring. The second gen Ford Focus has very similar car stereo wiring to the first generation. There are two exceptions however that you must be aware of. The second generation Focus Stereo Wiring uses the switched 12 volt accessory through the car's CAN data network.