Black with white stripe = Positive.
I tested this with a AC to DC wall plug.
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It really doesn't matter if you connecting the wire yourself. As long as you define one as positive and the other as negative and keep that same definition throughout the system, it will work.
The positive speaker wire is a solid color, your negative wire should have a stripe on it.
The white stripe on clear speaker wire is usually the positive wire. You may also find it with dashes and this is still the one that will carry the positive charge.
For a 1989 Toyota Camry, the wiring color codes for the radio typically include: Yellow: Battery (+12V) Red: Ignition (+12V) Black: Ground White: Left front speaker positive White with a black stripe: Left front speaker negative Gray: Right front speaker positive Gray with a black stripe: Right front speaker negative Green: Left rear speaker positive Green with a black stripe: Left rear speaker negative Purple: Right rear speaker positive Purple with a black stripe: Right rear speaker negative Always verify with a specific wiring diagram for accuracy, as variations may exist.
The speaker wire with a red stripe or marking is typically the positive wire.
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
I always use the black stripe as negative signal. Always do this and then when you have to disconnect something you won't get confused.(or as confused) but honestly it's just wire it's up to you.
the preious answer is very wrong. some car makers have a stripe on both wires. the best way to tell is leave the factory speaker hooked up take a 9 volt battery with wires attached to it and slide one wire into each connection. if the speaker pushes you have the positive and negative correct with the markings on the battery if the speaker pulls in the they are reversed. The wire with the stripe is the "negative" wire.
It actually does not matter as long as you are consistent. Most people choose to use the white stripe as positive, but it is definately not a rule.
According to color code, it is the speaker negative wire.
Yellow: 12v memory Red: 12v ignition (switched) Orange: Dash Light Black: Radio Chassis Ground Blue: Power Antennae White: Left Front positive White/Black Stripe: Left Front Negative Green: LR positive Green/Black Stripe: LR negative Grey: RF positive Grey/Black Stripe: RF negative Violet: RR positive Violet/Black Stripe: RR negative
Any marking (a white stripe, bump molded into the cable, different wire colours) is an indication for your reference only. It doesn't matter, as long as you connect the marked side on the amplifier to the same polarity on the speaker side.
In a DC circuit Red is positive and Black is negative. In AC systems White is neutral and Ground is green or green-yellow stripe.