@arobidoux sure you can. You did not tell us where it needs to be connected so we cannot provide you with more detail. Sometimes a picture is worth a thousand words Ajout d'images à une question existante
Alexarae Robidoux thank you for the images. You could cut the whole first couple inches of the wires. Then remove the insulation from the wire for a couple of inches and and resolder the new strands t the connectors. You may lose a few inches of the total length but at least you would know that the wiring is good. Apply either some shrink tubing or some liquid electrical tape after.
Yes, soldering is really the only way to make sure that the cables are completely connected and stay that way.
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