I bought a 2004 used F350. It came with no manuals so I ordered the vehicle and diesel owners manuals on eBay, nice set at a fair price. I read the frigging manual 3 times and can't find out what one of the dash selectors does, it's driving me nuts. In the attached pic you'll see the 4 wheel drive selector. To the right of that is a switch which looks like the letter P and some radio waves going to a tower. Does anyone know WTF this is?



dash pic

 

It's to turn off your back up sensor alarm

 

thanks, its no where in my manual!