Depending on colours of course black is usually negative and the other colour (generally red but depends) is positive. Get a D-cell Battery. Now get two pieces of speaker wire. hold one wire on the positive terminal of the battery and hold the other on the negative side of the battery. touch the wires to the positive and negative posts on the speaker. if the cone moves out ward the positive and negative are correct if it moves inward then the positive and negative are reversed (out of phase.) this simple test will allow you to see which terminal is which. Get a D-cell Battery. Now get two pieces of speaker wire. Hold one wire on the positive terminal of the battery and hold the other on the negative side of the battery. Touch the wires to the positive and negative posts on the speaker. If the cone moves outward the positive and negative are correct if it moves inward then the positive and negative are reversed (out of phase.) this simple test will allow you to see which terminal is which.
In a DC circuit it is positive. In a 220v ac circuit it's one of the two positive (hot) lines.
copper is positive
All you have to do is turn on the car into ignition area and grab a voltage meter. Find positive first, to do this, find a good ground spot on your vehicle, such as a screw or metal, than with the red meter wire, go around til you find one that makes the volt meter go up... that is your power wire. Now, go from that wire, and check for your ground wire. Hold the positive wire onto the positive spot on your vehicle, and use the black wire to check until the meter goes up, that is your ground. Now you are done.
The color of the wire does not indicate its polarity. In electrical systems, the polarity is typically designated as positive (+) and negative (-) rather than plus or minus. To determine which wire is positive or negative on a lamp connection, you would need to consult the manufacturer's instructions or use a multimeter to check the voltage.
The positive speaker wire is red while the negative speaker wire is black on a 2008 pathfinder.
The left rear speaker wire positive is -Yellow/Blue negative is - Black/Blue The right rear speaker wire positive is - Yellow/Red negative is - Gray/Red
Left Front Speaker Positive Wire (+): White/Red Left Front Speaker Negative Wire (-): Brown Right Front Speaker Positive Wire (+): Green Right Front Speaker Negative Wire (-): White/Orange
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
1999 Mitsubishi Mirage Car Stereo Wire DiagramCar Radio Battery Constant 12v+ Wire: Red/BlackCar Radio Accessory Switched 12v+ Wire: BlueCar Radio Ground Wire: ChassisCar Radio Illumination Wire: Green/WhiteCar Stereo Dimmer Wire: Black/YellowLeft Front Speaker Positive Wire (+): Red/WhiteLeft Front Speaker Negative Wire (-): Red/BlueRight Front Speaker Positive Wire (+): RedRight Front Speaker Negative Wire (-): BlueLeft Rear Speaker Positive Wire (+): Yellow/BrownLeft Rear Speaker Negative Wire (-): Yellow/RedRight Rear Speaker Positive Wire (+): Light GreenRight Rear Speaker Negative Wire (-): Yellow/Green
The presence of the red wire has no any other importance. The red wire connecting to the speaker is attached to the positive terminal. The black wire connects to the negative terminal.
The positive speaker wire is a solid color, your negative wire should have a stripe on it.
The left speaker wire (+) is dark green, and the left speaker wire (-) is brown/red in the door of a 1997 Dodge Ram. For the right speaker, the right speaker wire (+) is purple, and the right speaker wire (-) is dark blue/red.
2005 Chevrolet Malibu Stereo Wiring Information Radio Battery Constant 12v+ Wire: Red/White Radio Ground Wire: Black/White or Black Stereo Antenna Trigger Wire: Pink 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 Left Rear Speaker Positive Wire (+): Brown Left Rear Speaker Negative Wire (-): Yellow Right Rear Speaker Positive Wire (+): Dark Blue Right Rear Speaker Negative Wire (-): Light Blue
The red wire is the positive wire. The black wire is the ground wire. The yellow wire is the speaker wire. The white wire is the auxiliary wire.
The ground wire is a black. The positive wire is red. The speaker wires are yellow and green. The auxiliary wire is white.
Car Radio Battery Constant 12v+ Wire: Blue/Red Car Radio Accessory Switched 12v+ Wire: Blue/Yellow Car Radio Ground Wire: Black/White Car Radio Illumination Wire: Red/Black Car Audio Front Speakers Size: 5 1/4″ Car Audio Front Speakers Location: Doors Left Front Speaker Positive Wire (+): Brown/Black Left Front Speaker Negative Wire (-): Green/Red Right Front Speaker Positive Wire (+): Green/Orange Right Front Speaker Negative Wire (-): Blue/Orange Car Audio Rear Speakers Size: 5 1/4″ Car Audio Rear Speakers Location: Side Shelves Left Rear Speaker Positive Wire (+): Blue Left Rear Speaker Negative Wire (-): Yellow Right Rear Speaker Positive Wire (+): Pink/Blue Right Rear Speaker Negative Wire (-): Brown/Red