I have the same question...I removed the OEM radio from my 94 Ranger (no issues) and noticed the illumination wire. Checking the DEH-4400HD plug there is no IW (orange wire) to match up. Unfortunately, the local Ford shops here in town want $$ for their advice/workarounds. Does anyone have any workarounds/suggestions before I install the DEH-4400HD and experience what 'edinburgtx' has?