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Question DetailsAsked on 6/24/2017

I have a bundle of wires to connect, there are six total. 2 white, 2 red, 1 black and 1 yellow which ones are hot?

I am rewiring a charger cord my dog ate

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1 Answer


Sounds like you have a dual-voltage plus USB or 3-voltage charger.

Note - if a standard phone or computer charger, replacements (check voltages and amperage/wattage capacity closely for a match) they commonly only cost $10-25 to buy.

Obviously be careful, use double-insulated splicing (each splice insulated, then the entire opened up section sleeve insulated with heat shrink) - pros (if there is enough wire available) also stagger the splices so no two are right next to each other, so if the insulation fails or a splice pulls apart you do not get a short. Also, solder the splices if at all possible - especially with that fine a wire.

No guarantees (especially with stuff coming from Asia), but by standard conventions everything but white would be "live" or hot. Indelible ink or paint or nail polish or such mark the cord on both sides outside the area you will be cutting out (if it has not already been chewed in half) so you can realign the cord after cutting it. Many cords also have manufacturer lettering on them (embossed or printed on it) and/or have a ribbing or raised stripe down one edge that you can match up after cutting it.

Anyway, cut out the damaged section out and lay out the two new cord ends after you have stripped back the insulation for the connections - then lay the cut ends end-to-end so the matching colors match up (easier if it is a flat rather than round cord) - but you should be able to see the sequence of the wires and colors sticking out of the outer insulation after you strip it back for the splice (in sequence either across or around the cord) - then line the other cut end up so the same pattern lines up wire to wire. Say maybe your sequence might be black, white, red, white, yellow, red for instance from side to side or around the cord in a circle starting say the black in that case - then line up the other piece of cord so the same sequence shows (in mirror image of course), and splice the matching wires.

Obviously safest after splicing it, before using it, check the coltage across pairs at the outpuot connector (which should show the voltage coming in in a a diagram in your device owner's manual) - I would imagine you will likely find phone or computer voltage across 2 pairs (for 120V and 220/240V inputs) or maybe two different voltages coming out for phone and computer say (like maybe very low voltage like 2.5V or so, and maybe 3.5-5 volts on the other) on probably the black to white or red to white pairs, then a third voltage (like USB 5V) - depends on whether you have more than one connector on the charger. Look on the charger - if it has a slide switch (or may say it autoselects inpult voltage) and have one output connector, then it is likely 110/120v and 220/240V input with the switch in different positions and the same output voltage in both cases - around 2.5-3 V on some low power devices, commonly 3.5-6V for cell phones, more like 15-30V for laptops and tablets though some are less.

Answered 3 years ago by LCD

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