MSP to MP3 sub?

[dallas_miamiMP3]

http://www.mazdamp3.com/members/dallas_miamiMP3/cimg0160.jpg

 

[dallas_miamiMP3]

http://www.mazdamp3.com/members/dallas_miamiMP3/cimg0161.jpg

 

[dallas_miamiMP3]

http://www.mazdamp3.com/members/dallas_miamiMP3/cimg0162.jpg

 

[dallas_miamiMP3]

Yea so the blue and white stipe wire gous connected to the back of stereo. What if I spliced it can i connect it back. And can I use any wire for the power cord b cus the yellow wire was to short so i used the redwire to make it longer which was about the same guage. Can I use that same wire to connect the ground since it came with no ground wire.