So I'm making a completely new thread to get the ball rolling on this and put everyones thoughts/questions together in one thread. Maybe if enough "useful" info is put together, this will become a sticky.
I bought my 2005 F250 with all the options "I thought" I wanted. Then as time went on, I noticed some trucks had additional items like a rear power sliding window, or back up sensors, and these accessories to me have now become desirable. Coming from Toyota forums, when I had my Corolla, I used to to upgrade certain interior parts and pieces to upgrade some of the options that were found on higher level models and when doing this, I found mostly everything was plug & play. So it got me to thinking that it might be possible to do the same thing to the F250. I noticed when I did my radio install, behind the 4WD switch, there were some "dummy plugs" which I realized are likely the plugs for the power rear window slider and parking sensor switch.
Below is the "dummy plugs" behind the 4WD switch
Now, I'm not sure all the details. I can assure you that this WON'T work with all year models. Obviously swapping between 2005-2007 would be easier than say 2003-2006. It's best to stick with similar body/interior trim changes. It's possible that something from say 2003 might work on 2005, but until proven, we don't know. Also, let me just make clear, this has to do with accessories, electronics, and interior trim pieces mainly. I really don't want to talk about swapping engines and suspension parts. This is why I started the thread in the electronics section.
So on to my personal quest. I'm wanting to add 3 things. Eventually these things will be sorted out but my goals are to add, rear park sensors, cab lights, and power sliding window. This past weekend I snatched the Cab Clearance Lights and the harness from two trucks. First was from a 1999 F350 crew cab DRW from a buddy of mine (pictured below)
Not knowing what I was doing and frustrated with the the wasps flying around, I screwed up the harness since I couldn't get to it completely on the passenger side where it went down past the glove box, so I ended up cutting it. I also messed up one of the lights removing it since I got impatient. That same day, I went to a local junkyard and found another truck. This time a 03 F350 single cab DRW with the whole dash already removed. Made it nice an easy. This one was a plain work truck. So when I got both harnesses out, I noticed the two harnesses were slightly different. The 99 Dually had the overhead console with temp readout, so there was an additional plug for it. The '03 didn't have that so no extra plug.
Below is a picture of the two harness I grabbed. Notice the top one has the additional connector for the older style 99 overhead console (also this is the harness I cut so I don't have the connector to the kick panel). The 03 model which had no extra options, barely has any wires going down to the kick panel connector.
I was thinking the harness from the 99 might work better since mine has the additional plug for my auto dimming mirror, but the connector on the 99 was much larger. You can see in the harness comparison the connector about midway of the harness is pretty big compared to the mirror connector.
This is a picture of my mirror and part of the overhead harness with the smaller connector
This picture is behind the passenger side kick panel where the "overhead" harness plugs in. I'm now curious if my overhead harness has the connectors for the cab lights just resting up under the headliner possibly. I will be investigating this further.
The other parts I grabbed was the back up alarm and sensors. Which unfortunately the truck was missing one already but I will find one more later.
Here is a better picture showing the wires
Here is the 07 alarm sensor module and connector which is tucked up behind this same kick panel.
But the plug in connector for the sensors in the back was not. Below is a picture of the connector that the sensor harness plugs into from the donor truck. An 07 F250 crew cab SRW XLT.
I will have to do some more investigating, but I will be certain to post my findings as time goes by and I make progress. My next two steps will be to investigate my overhead harness more and see if it already has the connectors for the lights, and then see of there is another missing harness between the front passenger kick panel
to the back connector for the rear sensors.
I bought my 2005 F250 with all the options "I thought" I wanted. Then as time went on, I noticed some trucks had additional items like a rear power sliding window, or back up sensors, and these accessories to me have now become desirable. Coming from Toyota forums, when I had my Corolla, I used to to upgrade certain interior parts and pieces to upgrade some of the options that were found on higher level models and when doing this, I found mostly everything was plug & play. So it got me to thinking that it might be possible to do the same thing to the F250. I noticed when I did my radio install, behind the 4WD switch, there were some "dummy plugs" which I realized are likely the plugs for the power rear window slider and parking sensor switch.
Below is the "dummy plugs" behind the 4WD switch


Now, I'm not sure all the details. I can assure you that this WON'T work with all year models. Obviously swapping between 2005-2007 would be easier than say 2003-2006. It's best to stick with similar body/interior trim changes. It's possible that something from say 2003 might work on 2005, but until proven, we don't know. Also, let me just make clear, this has to do with accessories, electronics, and interior trim pieces mainly. I really don't want to talk about swapping engines and suspension parts. This is why I started the thread in the electronics section.
So on to my personal quest. I'm wanting to add 3 things. Eventually these things will be sorted out but my goals are to add, rear park sensors, cab lights, and power sliding window. This past weekend I snatched the Cab Clearance Lights and the harness from two trucks. First was from a 1999 F350 crew cab DRW from a buddy of mine (pictured below)

Not knowing what I was doing and frustrated with the the wasps flying around, I screwed up the harness since I couldn't get to it completely on the passenger side where it went down past the glove box, so I ended up cutting it. I also messed up one of the lights removing it since I got impatient. That same day, I went to a local junkyard and found another truck. This time a 03 F350 single cab DRW with the whole dash already removed. Made it nice an easy. This one was a plain work truck. So when I got both harnesses out, I noticed the two harnesses were slightly different. The 99 Dually had the overhead console with temp readout, so there was an additional plug for it. The '03 didn't have that so no extra plug.
Below is a picture of the two harness I grabbed. Notice the top one has the additional connector for the older style 99 overhead console (also this is the harness I cut so I don't have the connector to the kick panel). The 03 model which had no extra options, barely has any wires going down to the kick panel connector.

I was thinking the harness from the 99 might work better since mine has the additional plug for my auto dimming mirror, but the connector on the 99 was much larger. You can see in the harness comparison the connector about midway of the harness is pretty big compared to the mirror connector.
This is a picture of my mirror and part of the overhead harness with the smaller connector

This picture is behind the passenger side kick panel where the "overhead" harness plugs in. I'm now curious if my overhead harness has the connectors for the cab lights just resting up under the headliner possibly. I will be investigating this further.

The other parts I grabbed was the back up alarm and sensors. Which unfortunately the truck was missing one already but I will find one more later.

To answer your question, yes and no. The harness behind the kick panel was there on my truck with nothing plugged in to it. Here is the picture of mine

Here is a better picture showing the wires

Here is the 07 alarm sensor module and connector which is tucked up behind this same kick panel.

But the plug in connector for the sensors in the back was not. Below is a picture of the connector that the sensor harness plugs into from the donor truck. An 07 F250 crew cab SRW XLT.

I will have to do some more investigating, but I will be certain to post my findings as time goes by and I make progress. My next two steps will be to investigate my overhead harness more and see if it already has the connectors for the lights, and then see of there is another missing harness between the front passenger kick panel
to the back connector for the rear sensors.