I want to replace my OEM sub amp with an aftermarket on my 02 Navigator with an Alpine system. I bought a LOC but can't figure out the wiring. Where can I find the wiring diagram.

 

I found several diagrams, but nothing indicating a factory sub. I would say the easiest thing to do at this point is tap into the wires for the rear speakers for the LOC.

| RADIO 12V|lt green/purple |+ |at radio |
| RADIO GROUND|black |- |at radio |
| RADIO SWITCH|yellow/black |+ |at radio |
| RADIO ILLUMINATE|red/black |+ |at radio |
| LF SPEAKER|org/lt grn-lt blu/wh| |at radio |
| RF SPEAKER|wht/lt grn - grn/org| |at radio |
| LR SPEAKER|tan/yel - gry/lt blu| |at radio |
| RR SPEAKER|org/red - brn/pnk | |at radio |

 

Thanks, for the reply. Figured out that you have to tap the harness behind the OEM Deck and attach the LOC there. That is the only way to use a aftermarket amp and then rip out the ford garbage amp and sub and rplace. Thanks for your help.