I tapped the blue/gray sub wire on the factory amp for a line-out to my LC2i RCA converter.... no need for an remote wire, as it is signal driven. Ran my power directly from the battery (600w isn't really a draw). A JL 10TW3 w/600w is plenty of thump for me.
There's a sticky w/ the wiring schematics posted should you have any questions:
http://www.tahoeyukonforum.com/forum/showthread.php?t=68527
There's a sticky w/ the wiring schematics posted should you have any questions:
http://www.tahoeyukonforum.com/forum/showthread.php?t=68527