i did explain it ^^
Find the speaker wires off the back of the headunit - use that installdr wire chart that is posted below this.
Use some scotchlocks and run some new wires to a Line Out Convertor
Run RCA from line out convertor to amp.
TBH, Just remove the whole system10 setup. Its crap. With the age of the cars, the door speaker surrounds will be poked most likely. The 4"s in the dash point the wrong way. The rear speakers are in self contained boxes and are probably alright and the tweeters at the rear are also under covers and are probably alright.
Overall, its an overly elaborate system that doesn't produce a very good sound due to the age. Easiest thing to do is just chuck in a new headunit with some new speakers. That way you have the line out for a sub and you can play mp3's/ipod etc.
