2004 Ford Focus OE Wiring Harnesses & Stereo Adapters Ford Focus 2004, Aftermarket Radio Wiring Harness by Scosche®, with OEM Plug and RCA to Dash/Amplifier Plug Connector. Up yourself and your tunes over the factory installation with top-of-the-line audio products from Scosche. 2004 Ford Focus Stereo Wiring Harness - AutoZone Equip cars, trucks & SUVs with 2004 Ford Focus Stereo Wiring Harness from AutoZone. Get Yours Today! We have the best products at the right price.