welding cables under

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today I found that I had these desolate cables and I did not find anywhere how they were correctly, if someone can guide me to solder them again I would be grateful

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Upload an image so it will be better to identify them a better way to know is to connect the device and go testing cable x cable. Usually they are three cables one of earth and two of audio the one of earth is identified x being thicker q the other two. Start connecting the ground ... I say if it is a bass guitar. Since you do not specify aq under t refer.
English version: welding cables under