my car audio isnt working properly. there is some wire is out from amp its 1

end is connected to GND ? its 1 end of wire is connected to GND in amp but other end is out dont know where to join it or connect somebody help with this. my car amp is attachd to subwoofer in the trunk subwoofer and amp both are sony
 
You need to connect the other end of the ground wire (gnd) to the chassis of the car.. you must sand away some paintwork first and then securely bolt on the gnd wire..
 
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