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Old 15th Jul 2020, 5:50 pm   #3
Join Date: Jan 2016
Location: Stafford, Staffs. UK.
Posts: 973
Default Re: Polarity swapping wall wart connector leads

It's actually easier to swap the wires inline than put on a new plug. Of course this polarity swap device is easier still. I use the technique to extend supplies too. First see if there's any marking on the figure 8 cable to identify the wires. If not use something to mark. Cut the figure eight cable and split the two cores. shorten one on one side, by say 20mm. On the other half shorten the other lead by the same amount. Using small heatshrink for the individual cores and larger for overall strip and solder ends together. The offset puts the joins in different places. You keep the moulded plug at the end, and get to choose where the join is.
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