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This article was co-written by Ricardo Mitchell. Ricardo Mitchell is general manager of CN Coterie, an EPA-certified construction company based in Manhattan, New York. CN Coterie specializes in home improvement, electrical, plumbing, carpentry, furniture restoration, dismantling of OATH/ECB violators, and dismantling of DOB violators. Ricardo has more than 10 years of experience in the electrical and construction industry, his associates have more than 30 years of experience in the related industry.
There are 9 references cited in this article that you can view at the bottom of the page.
This article has been viewed 19,991 times.
When working with wires, it is important that you distinguish the wire’s electrode. Some wires are clearly marked with a plus (anode) or a minus sign (cathode), while others are not. For unmarked wires, you can try to identify them first by looking at physical features such as color or texture. If you’re still unsure, check the wires with a digital multimeter. Once the electrode is identified, you can proceed to what you need to do.
Steps
Identify wires in common situations
- If the other thread is smooth, it’s a positive wire.
- Sometimes the ground wire will be copper color instead of green.
Other case
For multi-colored wires including red and black, the black wire is the negative wire and the red wire is the positive wire .
If both wires are black but one of them has a white stripe, the striped one is negative and the plain black one is positive . [5] X Research Sources
- If you no longer have the manual, look it up in the library or online. You can also contact a technician at your local dealer or shop.
Using a digital multimeter
- An analog multimeter should not be used to test electrodes. The needle-pointing multimeter can be damaged if you connect the wrong leads.
- Check that the black probe wire is plugged into the “COM” port located on the front of the multimeter. Besides, the red probe also needs to be connected to the port marked volt (“V”) on the meter.
- If there is no indicator, first check to see if the alligator clamp secures the probes to the wire.
- If the readings still do not appear on the screen, you need to replace the multimeter battery and try again. It is also possible that there is a problem with the probe wire, so the multimeter does not display the reading. In this case, you need to buy a new probe.
- If the multimeter shows a negative reading (such as -9.2), it means that the two probes are connected in the opposite direction and the wire that the red one touches is the negative wire.
- For example, after swapping the positions of the two probes, the previous index of -9.2 will become 9.2.
- If the display still shows a negative reading, the multimeter may be faulty. You can take the device to an electronics store to have the fuse checked or buy a new multimeter.
Warning
- The reverse polarity in the circuit can damage the power supply, even cause an explosion.
- If you make a mistake (such as wiring the positive wire while using the negative wire), the power cord can burn.
- Never use an analog multimeter if you are not sure about the electrode of the wire. Connecting the wrong probe to the wrong electrode can damage the multimeter.
This article was co-written by Ricardo Mitchell. Ricardo Mitchell is general manager of CN Coterie, an EPA-certified construction company based in Manhattan, New York. CN Coterie specializes in home improvement, electrical, plumbing, carpentry, furniture restoration, dismantling of OATH/ECB violators, and dismantling of DOB violators. Ricardo has more than 10 years of experience in the electrical and construction industry, his associates have more than 30 years of experience in the related industry.
There are 9 references cited in this article that you can view at the bottom of the page.
This article has been viewed 19,991 times.
When working with wires, it is important that you distinguish the wire’s electrode. Some wires are clearly marked with a plus (anode) or a minus sign (cathode), while others are not. For unmarked wires, you can try to identify them first by looking at physical features such as color or texture. If you’re still unsure, check the wires with a digital multimeter. Once the electrode is identified, you can proceed to what you need to do.
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