OK so a buddy of mine has a 2006 lincoln ls. and the only wire harness he can get is a 350$

anyhow, we installed a aftermarket h/u in it and cant get any sound through the speakers. so what i was going to do is tap into the stock amplifiers inputs and splice a set of rcas onto them and run the rcas to the h/u. problem is i cant quite figure out which wires are the inputs from any harness's ive looked at.

$350? http://www.sonicelectronix.com/item_12664_Metra-70-5521.html should of been fine.

easier to just get 4 new speakers than deal with the factory amp and speaker nonsense.

He doesnt want to spend 350 on a harness thats the problem

And it has the thx/navi 10 speaker system and they dont make harnesses for that model another friend of mine paid 500$ for the local audio shop to custom wire everything because even they couldnt get there hands on one. Which is what im trying to do for him