Originally Posted by texasbullseye89
can someone tell me the difference between the harnesses on a 99 3.o FF and a 01-03 4.o sohc? as in im swapping the engine in my truck possibly, and dont want to rewire the whole thing.
The engine/transmission harness is completely different and you would need to swap it over with the donor engine. You will also need the donor's PCM and a compatible transmission.
The big differences are in the PATS, ABS, speedometer and charging system wiring. You will need to move several wires. Best bet is to get a Ford factory Wiring Diagram manual for each vehicle and start comparing. I get mine from "Lorie and Jeff"