1991 Ford Mustang | Stereo Wiring Diagram 1991 Ford Mustang Stereo Wiring Information. Radio Battery Constant 12v+ Wire: Green/Yellow Radio Accessory Switched 12v+ Wire: Yellow/Black Radio Ground Wire: Chassis Radio Illumination Wire: Blue/Red Stereo Antenna Trigger Wire: Orange/Blue Left Front Speaker Positive Wire (+): Orange/Green Left Front Speaker Negative Wire (-): Light Blue/White Right Mustang Complete Wiring Harnesses | Wiring Harness Kits Sep 03, 2020FOLLOW: mustang, 79 93 mustang, 94 04 mustang, 05 09 mustang, 10 14 mustang Don't let bad wiring harnesses slow your Mustang project! With the help of 5to new replacement wiring harnesses and pigtails, you can finally put those annoying wiring Related searches for 1991 mustang radio wiring chevy radio wiring diagramford radio wiring diagrams