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I just changed all 8 glow plugs, wiring harness, and control module. While I was in there I found what looks to be some type of sensor not connected to anything, and a 6 prong wiring connector with no wiring coming in to it. I have no check engine light and I have a programmer to read codes even if there was. The only thing that doesn’t work on my truck is my cab clearance lights, which I doubt either of these go to. There’s also 4 wires that are cut that lead into the cab of the truck which I have no idea what they are for either. Any suggestions or anyone know what these are for?
The 6 prong thing looks like the MAF sensor plug, which on my 05 is on the intake tube. I have no idea what the sensor that’s on the other side of it is, with the plastic protecting what looks like a probe.
The thing #3 is pointing to
The cut wires seem to be on most trucks, I want to say they had something to do with the optional accessory switches? But I could be totally wrong on that. I just know I have those wires on my 05 Excursion, too...and have seen them on several other trucks.
The four wires going inside the cab are probably the stub ends for the upfitter (adding accessories like a winch, or aux tank pump) switches on your dash, if you have that option. If you don't, there're still there in the harness.
Never seen the other two, but one does look like a MAF sensor.
Awesome thanks for the help everyone! This is my second 6.0l but I never noticed those 2 random sensors/probes/ whatever they are haha. I thought it might be a MAF sensor since that’s the only 6 wiring connector I can find in the manual. I won’t worry about it too much.
There is wiring with the upfitter switches - it comes as a complete kit. I connected the upfitter outputs to the through cables so power goes directly through the firewall.
As already mentioned above, the six wire cavity connector is for the MAF sensor on trucks so equipped. The other sensor is your IAT #1 sensor, on your late-build 2005 model year 6.0 F-Series (early-build 2005 model year 6.0s do have a MAF with IAT #1 incorporated into the MAF). As far as why it's sitting in the engine compartment free, is subject to speculation that you either have an aftermarket air intake with no place for it go, and/or someone had the air intake removed for whatever reason, and simply forgot to reinstall it.
