Generally, yes.
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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
Positive and negative wires are commonly found in electrical circuits. The positive wire carries the flow of current from the power source to the load, while the negative wire completes the circuit by providing a return path for the current to flow back to the power source. The positive wire is typically colored red, while the negative wire is usually colored black. It is important to correctly identify and connect these wires to ensure proper functioning of the circuit and to prevent damage to the components.
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.