The best place to buy speaker wires would be at Walmart. They have many different options available for purchase. They are also very helpful and give good advice on what to purchase.
The positive speaker wire is a solid color, your negative wire should have a stripe on it.
2006 Mazda 6 Car Stereo Radio Wiring Diagram Radio Constant 12V+ Wire: Blue/RedRadio Switched Ignition 12V+ Wire: OrangeRadio Ground Wire: BlackRadio Illumination Dimmer Wire: Light Green/RedRadio Antenna Trigger Wire: N/ARadio Amplifier Turn On Wire: Blue/BlackFront Speaker Size: N/AFront Speaker Location: N/ALeft Front Speaker Wire (+): RedLeft Front Speaker Wire (-): WhiteRight Front Speaker Wire (+): BlueRight Front Speaker Wire (-): YellowRear Speaker Size: N/ARear Speaker Location: N/ALeft Rear Speaker Wire (+): PurpleLeft Rear Speaker Wire (-): PinkRight Rear Speaker Wire (+): White/BlueRight Rear Speaker Wire (-): Black/Blue
Couple options. Strip off a half inch of insulation of the wire were the wire is separated. The splice the wires together. Apply electrical tape to the area that the wires were spliced. Or, replace the whole wire. I recommend replacement.
Battery Constant 12v+ Wire: WhiteAccessory Switched 12v+ Wire: White/BlackGround Wire: BlackIllumination Wire: Red/YellowDimmer Wire: Red/GreenAntenna Trigger Wire: PinkLeft Front Speaker Positive Wire (+): WhiteLeft Front Speaker Negative Wire (-): Black/BlueRight Front Speaker Positive Wire (+): BlueRight Front Speaker Negative Wire (-): White/RedLeft Rear Speaker Positive Wire (+): Light GreenLeft Rear Speaker Negative Wire (-): Light Green/BlackRight Rear Speaker Positive Wire (+): GrayRight Rear Speaker Negative Wire (-): Gray/Black
In a 1994 Corolla, the radio battery constant 12v+ wire is blue/yellow, the radio accessory switched 12v+ wire is gray, the ground wire is brown, and the illumination wire is green. For the front speakers, the left front speaker wire (+) is pink, the left front speaker wire (-) is violet, the right front speaker wire (+) is light green, and the right front speaker wire (-) is blue. For the rear speakers, the left rear speaker wire (+) is black, the left rear speaker wire (-) is yellow, the right rear speaker wire (+) is red, and the right rear speaker wire (-) is white.
1998 Toyota Tacoma Stereo Wiring InformationRadio Battery Constant 12v+ Wire: Blue/YellowRadio Accessory Switched 12v+ Wire: GrayRadio Ground Wire: BrownRadio Illumination Wire: GreenLeft Front Speaker Positive Wire (+): PinkLeft Front Speaker Negative Wire (-): PurpleRight Front Speaker Positive Wire (+): GreenRight Front Speaker Negative Wire (-): BlueLeft Rear Speaker Positive Wire (+): BlackLeft Rear Speaker Negative Wire (-): YellowRight Rear Speaker Positive Wire (+): RedRight Rear Speaker Negative Wire (-): White
For the front speakers in a 1993 Ford Ranger pickup truck, the left front speaker wire (+) is orange/green, the left front speaker wire (-) is black/white, the right front speaker wire (+) is white/green, and the right front speaker wire (-) is black/white. For the rear speakers, the left rear speaker wire (+) is pink/green, the left front speaker wire (-) is pink/blue, the right rear speaker wire (+) is pink/blue, and the rear right speaker wire (-) is green/orange.
Constant 12V+ Wire: Light Green Ignition Switched 12V+ Wire: Black/Yellow Ground Wire: Black Illumination Wire: Blue/Yellow Dimmer Wire: N/A Left Front Speaker Wire (+): Green Left Front Speaker Wire (-): Blue/Red Right Front Speaker Wire (+): Light Green/Yellow Right Front Speaker Wire (-): Black/Green Left Rear Speaker Wire (+): Green/Yellow Left Rear Speaker Wire (-): Blue/Orange Right Rear Speaker Wire (+): Green/White Right Rear Speaker Wire (-): Green/Blue
Radio Constant 12V+ Wire: Blue/Yellow Radio Switched 12V+ Wire: Gray Radio Ground Wire: Brown Radio Illumination Wire: Dark Green Dimmer Wire: White/Green Antenna Trigger Wire: None Front Speaker Size: 6 1/2″ Front Speaker Location: Doors Left Front Speaker Wire (+): Pink Left Front Speaker Wire (-): Purple Right Front Speaker Wire (+): Green Right Front Speaker Wire (-): Blue Rear Speaker Size: 6″ x 9″ Rear Speaker Location: Rear Deck Left Rear Speaker Wire (+): Black Left Rear Speaker Wire (-): Yellow Right Rear Speaker Wire (+): Red Right Rear Speaker Wire (-): White
1997 Toyota Tercel Car Stereo Radio Wiring Diagram Radio Constant 12V+ Wire: Blue/YellowRadio Switched 12V+ Wire: GrayRadio Ground Wire: BrownRadio Illumination Wire: GreenRadio Dimmer Wire: N/ARadio Power Antenna Trigger Wire: Black/RedRadio Amplifier Turn On Trigger Wire: N/AFront Speakers Size: 4″Front Speakers Location: DoorsLeft Front Speaker Wire (+): PinkLeft Front Speaker Wire (-): PurpleRight Front Speaker Wire (+): Light GreenRight Front Speaker Wire (-): BlueRear Speakers Size: 6 1/2″Rear Speakers Location: Side PanelsLeft Rear Speaker Wire (+): BlackLeft Rear Speaker Wire (-): YellowRight Rear Speaker Wire (+): RedRight Rear Speaker Wire (-): White
The color of speaker wire doesn't matter, it's what it's made of. Also, expensive speaker wire is a rip off. You should just buy cheap speaker wires and that's good.
In a Ford Fiesta, the radio constant 12v+ wire is yellow/red, the ground wire is black/blue, and the illumination wire is blue. For the front speakers, the left front speaker wire (+) is white, the left front speaker wire (-) is white/brown, the right front speaker wire (+) is white/violet, and the right front speaker wire (-) is white/orange. For the rear speakers, the left rear speaker wire (+) is white/green, the left rear speaker wire (-) is brown/yellow, the right rear speaker wire (+) is brown/white, and the right rear speaker wire (-) is brown/blue.