The radio may be defective, pull it out and verify power to the radio, u can buy the radio removal tools at any NAPA parts store or get them from Ford, they are very cheap to buy. here is the wiring colors and what they do, u will also need a cheap 12 volt test light, about $6
1993 Ford Explorer Car Stereo Wiring Diagram
Car Radio Battery Constant 12v+ Wire: Light Green/Yellow
Car Radio Accessory Switched 12v+ Wire: Yellow/Black
Car Radio Ground Wire: Red or Black
Car Radio Illumination Wire: Orange/Black
Car Stereo Dimmer Wire: Light Blue/Red
Car Stereo Antenna Trigger Wire: N/A
Car Stereo Amp Trigger Wire: Blue
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: N/A
Car Audio Front Speakers Location: N/A
Left Front Speaker Positive Wire (+): Orange/Light Green
Left Front Speaker Negative Wire (-): Light Blue/White
Right Front Speaker Positive Wire (+): White/Light Green
Right Front Speaker Negative Wire (-): Pink/Light Green
Car Audio Rear Speakers Size: N/A
Car Audio Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): Pink/Light Green
Left Rear Speaker Negative Wire (-): Tan/Yellow
Right Rear Speaker Positive Wire (+): Orange/Red
Right Rear Speaker Negative Wire (-): Black/White
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I have the same problem. My radio and dome light both stopped working out of nowhere. Everytime i place a fuse in the terminal it pops instantly. Any other ideas? Thanks Duane
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