![]() ![]() The only way to be sure is to use a voltmeter and measure the voltage across the two wires. *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 solid/dashed lines on wires like the ones pictured in your question are used to indicate polarity e.g. ![]()
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