grounding my car radio (pic)?

Ben

New member
Hi, i bought a car recently and i inserted 6x9 speakers in the rear. But i have noticed that there are 2 blue wires that are bare (in pic). One coming from main connection and one coming from the aerial.
Has this come loose, do i connect these 2 wires to earth the radio?

http://img3.imageshack.us/img3/8990/img4198t.jpg
 
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