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That's a little tougher than aftermarket ones.All I can suggest is to possibly try a local library.Call and see if they have haynes repair manuals.Some do,some don't.There will be a diagram for it in there with color codes.If they don't have one,you can ask a local dealer if they are willing to give you one at low cost,no cost or even just buy a haynes manual at a national auto parts store,depending on how much car work you do.They go for about $20-$25.Sorry I couldn't do more.You could even just go to "look" at a manual at the parts store and bring a pen and paper and write down the wire codes.
2003 Mercury Sable Car Radio Wiring Schematic
Car Radio Battery Constant 12v+ Wire: Green/Yellow Car Radio Accessory Switched 12v+ Wire: Yellow/Black Car Radio Ground Wire: Black/Light Green Car Radio Illumination Wire: Light Blue/Red Car Stereo Dimmer Wire: N/A Car Stereo Antenna Trigger Wire: N/A Car Stereo Amp Trigger Wire: N/A 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 (-): Dark Green/Orange Car Audio Rear Speakers Size: N/A Car Audio Rear Speakers Location: N/A Left Rear Speaker Positive Wire (+): Gray/Light Blue Left Rear Speaker Negative Wire (-): Tan/Yellow Right Rear Speaker Positive Wire (+): Orange/Red Right Rear Speaker Negative Wire (-): Brown/Pink