Engine compartment wiring question.

[BigFish]

The truck in question is a 2006 mega cab 2500, 5.9. There are 2 plugs on the drivers side of the engine bay that don't seem to have an obvious home and I'm not familiar enough with these trucks yet to know where they should connect. The truck has a fass titanium installed and fuel bowl delete, so I don't know if they originally plugged into a part thats no longer present or if I'm missing something. All work done on the truck was before I bought it so I'm lost when I find crap like this.
Any help is appreciated

 

[Odp]

It looks like the one plug used to go to the stock fuel filter assy to me. My truck also has the second plug above the ecm that is not plugged into anything

 

[p-Bar]

Yeah that one was for the water in fuel light

 

[AH64ID]

WIF sensor and fuel heater are my guesses. For whatever reason 06-07 5.9’s don’t have the ECM plug from the factory.

 

[BigFish]

Good info guys. I looked up the water in fuel sensor plug and that does seem to be it. The other one, I still haven't been able to confirm.
Will it do any harm to have those plugs left that way and just zip tie them up out of the way to tidy things up? Or do I need to remove the plugs and properly terminate the pigtails?

 

[p-Bar]

I would just black tape the open electrical area and zip tie them.