I'm trying to put in some power seats from a 2000 expedition (power everything, heat, and memory) into my 2000 XLT F150(60/40 seats, manual everything), and I'm having a helluva time trying to get it working. The only wires I have under the carpet of my truck are the wires that look like they're for the seatbelts or something.

Underneath the driver seat is a whole mess of wires in a big heatshrinked tube, some idiot cut off the plastic harness(s) it looks like. From what I've read (very little) I just need to feed the green wire to a 12V positive and ground the black wire to get basic power functions. The problem is I've grounded the black wire to a bolt hole for the seat, and I've tapped the green wire into my amp remote start cable that feeds into the head unit. This didn't work. Then I tried plugging the green cable into a harness on the passenger side that had what looked like both green and black cables. That didn't work either. There are several harnesses on both the driver and passenger kickpanels, but I have no idea what they do. Can anybody help me on that?

I'm really at a loss here of what to do. I can't bolt the driver seat down untill I get the power working because the seat is all the way back, blocking the two rear bolt holes. Anybody have some advice? I'm far from an electrician but I'm able to wire up stereos and what not easily enough.

Here's a pic of the wires underneath the driver seat:

 

bump I really need this fixed fast