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If you have an old school test light, you can turn the radio on and ground your test light to a suitable ground and stick the probe into the wires and the light will light up when it's on the positive side. Most of the time, the wires are two colors, one is a copper/bronze color and the other leg is usually a silver color. I always wired mine up as the copper color of the two were positive side and silver color negative.
thanks guys... I finally came across a wiring diagram from an audio site.
1993 Ford Mustang Car Audio Wiring Schematic
Car Radio Battery Constant 12v+ Wire: Green/Yellow
Car Radio Accessory Switched 12v+ Wire: Yellow/Black
Car Radio Ground Wire: Chassis
Car Radio Illumination Wire: Blue/Red
Car Stereo Dimmer Wire: N/A
Car Stereo Antenna Trigger Wire: Orange/Blue
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: 5 1/4″
Car Audio Front Speakers Location: Doors
Left Front Speaker Positive Wire (+): Orange/Green
Left Front Speaker Negative Wire (-): Light Blue/White
Right Front Speaker Positive Wire (+): White/Green
Right Front Speaker Negative Wire (-): Green/Orange
Car Audio Rear Speakers Size: 5″ x 7″
Car Audio Rear Speakers Location: Side Panels
Left Rear Speaker Positive Wire (+): Pink/Green
Left Rear Speaker Negative Wire (-): Pink/Blue
Right Rear Speaker Positive Wire (+): Pink/Blue
Right Rear Speaker Negative Wire (-): Green/Orange
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