loose wires under dash

[d and b installer]

In the bundle of wires above the parking brake what do each of those loose wires do. I have done the high idle mod I know that the red blue white and one other go through the firewall but what are the striped ones that remain.

[dazdillenger]

one should be high idle, one is PTO, locks the converter/high idle. The others, I'm not sure.

[Acidsniper]

Are they orange / green stripped and just behind the fuse panel? If so and there's 4 of them they're more than likely your upfitter switch wires. The wires running through the firewall are just convenience wires that were put in by Ford to make it so you yourself don't have to try and run wires through the firewall. You can use them for whatever you want.

Do the wires run to any fuse blocks? Can help determine what they're for if you're not talking about those wires above.

[dazdillenger]

03=no upfitter switches.

[NYC F-350]

All of them have to do with high idle.
One is for the high idle that does not involve the PTO, and does not lock the torque converter.
The other three are for the pto style high idle (and locks the torque converter). One sets the idle, one can be wired to a potentiometer to vary idle speed and the other is for an indicator light.

At least this is the way I understand it. Also keep in mind I am thinking of what is on my truck, which is an 06. Not completely sure it is the same on an 03, but I believe that it is not the same.