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Distinguir os fios positivo e negativo para ligar o auto-radio

Bom dia,pode me demonstrar quais os fios que sai do auto-radio para fazer a ligação,pois tenho 3 fios com fusivel e um preto que julgo ser o negativo,obrigado.

Good morning, can you show me which wires come out of the car radio to make the connection, because I have 3 wires with fuse and a black that I think is negative, thank you.
 

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tomirevesz
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