![]() ![]() If you get a negative voltage reading, you know you have the test leads swapped. The only way to be sure is to use a voltmeter and measure the voltage across the two wires. Many transformers have separate coils, as shown in figure 3, and contain many turns of wire and a magnetic core, which forms a path for and concentrates the. *I say " usually" since I've seen a wall wart with the wires were reversed, although every other wall wart I've used does it the way I've described above. ![]() text providing wire information, a stripe, etc.) is the positive end, and the unmarked wire is the negative end. This kind of convention is used on speaker cables as well, where the wire that is marked in some manner (e.g. It doesn't matter if it is striped or dashed, the presence of any kind of marker is the indicator of the wire being the "positive" end of things, as opposed to the unmarked "negative" wire. Usually* the wire with the white stripe or the dashed lines carries the "positive" (+) end, while the other, unmarked wire carries the "negative" (-) end. The turns ratio between the input and output wire coils provides either an increase or a decrease of the applied signal as it passes through the transformer. These are the same for all ATX power supplies: 3.3V wires are orange +5V wires are red -5V wires (if they are present) are white +12V wires are yellow -12V wires are blue ground wires are black. The solid/dashed lines on wires like the ones pictured in your question are used to indicate polarity e.g. Project Steps Identify the Wires on the 20 Pin (or 24 Pin) Connector The wires on the main 20 pin (or 24 pin) connectors are color coded.
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