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. *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. A search for 'standard European color codes for power cables' yields the following information: European (IEC) Wire Color Codes. is a black wire always ground and red always 12/5 volts and in the manual of my sabertooth z77 motherboard it lists the different.
5-Green Cloth insulated wireHeater wiring twisted. I prefer Green for grounds but if Im running short sometimes use black. text providing wire information, a stripe, etc.) is the positive end, and the unmarked wire is the negative end. 2-RedAll DC voltage generated from power supply from rectifier to first gian stage v1. USE COUPON CODE: FLIP25YEARS TO GET 10 OFF OFDERS OVER 125.00.
This kind of convention is used on speaker cables as well, where the wire that is marked in some manner (e.g. FLIPTOPS 25TH ANNIVERSARY 10 OFF SALE ON ORDERS OVER 125.00. 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. Jameco Valuepro 102111-R Power Transformer, 24 VCT/1A, 115/230 Vac, Wire Leads, 2.41' L x 2.80' W x 1.
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