First off, I will say this is not for the faint of heart, I would bet I easily have 80 hours into doing this. Now I could do it faster if I were to do it again but I'm just saying, be prepared for it to take you about a week.
Getting started, you will need everything, I'm not joking, almost every wire in your interior will be swapped.
This is my before, nice tan Lariat seats, ugly grey XL everything else.
This is the other truck, the harness you see hanging down on the left hand side is what you want... well part of it.
A few hours later, here it is out of the parts truck, this was about 5 hours total, and that's with the interior already dismantled.
I wasted some time here so I'll give some tips. I spent a very long time getting the wires unclipped for the door lock actuators, I took them apart completely from within the door. Look up any of the "Foil Mod" or "Door lock actuator fix" videos/ threads for the easy way. Other than that there isn't much I can give in the way of pointers, this part is fairly self explanatory, follow the harness and unplug/rip/pull as you go.
The one benefit to doing it the hard way is I was able to walk the door over to time truck, plug the harness in under the dash and test it out.
I also took a video at this time... yes I held my phone the wrong way, yes I wasted time screwing around... hey I was learning, but it does show some important things.
My comment about fuse panels was not entirely correct as I learned immediately after taking that video. I will go into more detail near the end of this write up as that's when I delt with the issues.
Now the part that made me nervous, this was the point of no return.
Pull my dash.
This is actually quite easy:
Remove the steering column covers.
Remove multi-function switch.
Disconnect everything else.
There are 4 bolts that hold the steering column to the dash, and 1 keyway bolt that connects tot he steering shaft.
Unbolt and wiggle it out ( much easier without the drivers seat but I left mine in)
Two bolts on each end of the dash by the doors, and there is one bolt up and to the right ( towards the center of the truck) of the gas pedal. The lower HVAC duct work somewhat covers it, but it's the same greenish colour as the outer bolts.
Also up buy the windshield ( forgot the take pictures ) There is 3 covers with 5 bolts that need to come out.
And that's about it it should come forward, and you will be able to cut the main body harness away from the dash. Caution here.
In this picture, the thin harness on the firewall is the one for the interior functions, the big fat on near the bottom is for all kinds of other things. The big one is attached to the back of the dash in a very stupid fashion. Carefully cut the tape, and open up the holders with a screwdriver( you'll see what I mean)
Some things are better to take out before you remove the dash:
Passenger side airbag ( makes me nervous to be part of a dash I'm moving around)
Both cigarette lighter and power point
"Air bag off" switch
Once you have everything disconnected, get a buddy and lift it out of your truck.
The you will see this
At this point I honestly had some thought's of apprehension, it's a bit overwhelming to look at, especially in your baby
I didn't take any pictures of routing the harness back in behind the dash, you won't need them it all only fits one way and if you're tackling this I'm going to assume you are a good problem solver.
That was my next step though, I put the dash back together.
And now the fun part.
You have 3 options for dealing with this:
1)Cut the boot and tape it back up, would look like ***
2) Take apart every connector on the end of the harness so you can side the boot off, fish the wires into the door, then put that back together
3)Be a man about it and stuff the whole damn thing though the door, as you can see that's what I chose
It wasn't a problem removing your old one because, if you're anything like me, you just cut it out.