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When changing anything electrical it is important to have gloves and a diagram. The wiring diagram for a stereo in a 2001 Chrysler Voyager can be found in the maintenance manual.
Modifiedlife.com
The stereo wiring diagram for the 2001 Chevrolet Blazer can be found in the owner's manual. The owner's manual is in a black jacket and most vehicle owners keep it in their glovebox.
http://www.modifiedlife.com/2001-hyundai-accent-car-stereo-radio-wiring-diagram/
www.the12volt.com
Yes, there is a free stereo wiring diagram for this car. It is in its maintenance manual, or a person could ask for a print out at an auto part store.
2001 Infiniti QX4 Car Stereo Radio Wiring Diagram
http://www.modifiedlife.com/car-radio-wiring-diagram-and-car-stereo-wire-diagram-2001-saturn-sc1/ orange and yellow wires are power
http://www.the12volt.com/installbay/forum_posts.asp~TID~64251
It is easiest and safer to go out and buy a new wiring harness. However, if someone is to rig the wiring it is best if the google image the diagram and pay careful attention to each wire.
The wiring diagram has four wires. Brown wire for parking lights, green and yellow wire for for stop light and white wire for common ground.
It is the same as my '01 Focus. The schematic is here: http://www.modifiedlife.com/2001-ford-focus-car-stereo-wiring-diagram/ Basically it will tell you what color wire does what