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l am trying to install new speakers on my mazda 3 2010 gx model sedan but l am having trouble figuring the + and - negative wires...If anyone has any info on that please let me know....
 

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l am trying to install new speakers on my mazda 3 2010 gx model sedan but l am having trouble figuring the + and - negative wires...If anyone has any info on that please let me know....
There are some post about it in these forum mazda3. Lock for add a new aftermarket subwoofer or something like that
 
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