Originally Posted by rem1981
Assuming you have the upfitter switches, correct?
No, under the dash behind the fusebox on my 05 you have your choice of sending 12v to the pto wire or the battery charge protect wire. The upfitter switches just make a nice install, however you could use any switched 12v source. I guess it wouldn't even have to be switched,but in that case every time you applied the e-brake in park the truck would idle up. I don't have the wire colors handy right now ,but they were labled very well on my 05. There is also a provision with 3 other wire you can connect to a Potentometer and vary the high idle speed if your application requires that as well. I connected my #4 upfitter switch to the PTO wire with a 6inch jumper and was done in 10 min.