Question on wirng aftermarket sub amp in LS

[manny18]

Newbie question here, I have a 2001 Lincoln LS with Alpine 6 CD in dash with factory preamp Subs in the deck. I just bought an aftermarket 1600W Sub amp with JL audio pair of Subs. How do I wire the amp input(s) in place or in conjunction with the factory Sub preamp and woofers?

[Quik_LS]

The trunk connector (on the drivers side) is number C465 and the sub audio uses these pins:
1 = yellow/red: switched hot
3 = shield for low level audio signal
5 = red: constant power from battery junction box fuse F418 (20 amps)
7 = white/red: low level LEFT audio signal
8 = grey/red: low level RIGHT audio signal

[manny18]

Thanks a lot Quick LS, do I disconnect and remove the preamp and factory subs completely?

[Quik_LS]

Originally Posted by manny18

Thanks a lot Quick LS, do I disconnect and remove the preamp and factory subs completely?

right - the LS uses a seperate sub-woofer amp - 85W - that drives the two rears.