Car audio I have a 94 Saturn SL, and every car radio i buy for it the wires in the car never match with the equipment. Is there a manuel that tells the wiring color code?

Here are the wire colors and what they do in the system. Please rate my help.

1994 Saturn SL Car Radio Stereo Wiring Diagram
Car Radio Battery Constant 12v+ Wire: Orange
Car Radio Accessory Switched 12v+ Wire: Yellow
Car Radio Ground Wire: Black
Car Radio Illumination Wire: Gray
Car Stereo Dimmer Wire: Brown
Car Stereo Antenna Trigger: 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 (+): Tan
Left Front Speaker Negative Wire (-): Gray
Right Front Speaker Positive Wire (+): Light Green
Right Front Speaker Negative Wire (-): Dark Green
Car Audio Rear Speakers Size: N/A
Car Audio Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): Brown
Left Rear Speaker Negative Wire (-): Yellow
Right Rear Speaker Positive Wire (+): Dark Blue

You can use a battery size AA find the wire for speaker its a pair ( 2 wires) , usually the color is will not differ some time if pos. no stripe then the neg. has stripe color on it. connect the wire to the batt. and you can hear sound upon touching it to batt. if the wire ic going to the speaker. so you will need only the diagram for new radio.

All you need to do is get a forward and a reverse wiring harness for the radio. go to any type of car audio shop that deals only with car audio and such.

The best way to do it is to buy a wiring harness for your car, go to an automotive place and ask for the correct wiring harness for your car.