Constant Power, Maybe by PTO??

[Ace_boy2786]

Hi, First off I'm sorry if this has been covered somewhere else but upon doing a search for PTO and not finding what I was looking for I figured I'd ask.

I've seen PLENTY of topics about the High Idle mod for the 2006 Year Range F350s (Mines a 2006 F350) But I have been looking for info about if there is a wire in that PTO/SCIE(don't remember the abbreviation) Bundle behind the fuse box that I can put a constant power to (say Upfitter Switch) that will engage a Constant run until Brake is depressed feature, Kind of like what Cop cars have and I'm sure the paramedics and Fire Trucks have the same features, but I don't know for sure.
I'm trying to find a nice cheap mod, hopefully I can just connect a wire there to an upfitter switch like the high-idle mod does. Anyone with info who can help would be appreciated.

I currently have a relay setup from the12volt.com in mind but if it is easier and/or already incorperated into my truck That would be a heck of a lot easier to hook up.