2014 Ford Focus Car Stereo Wiring Instructions Whether your an expert Ford Focus mobile electronics installer, Ford Focus fanatic, or a novice Ford Focus enthusiast with a 2014 Ford Focus, a car stereo wiring diagram can save yourself a lot of time. Automotive wiring in a 2014 Ford Focus vehicles are becoming increasing more difficult to identify due to the installation of more advanced factory oem electronics. 2014 Ford Focus OE Wiring Harnesses & Stereo Adapters Ford Focus 2014, Wiring Harness with Amplifier Bypass Plug by Metra®. For aftermarket stereo. Metra preassembled wiring harnesses can make your car stereo installation seamless, or at least a lot simpler.