I have bought an F-350 with the old grandpa style mirrors on it, it’s an xlt package. My question is, even though the mirrors aren’t powered, are there wires in the door to run power mirrors? And if so, how would I go about running a switch?

 

What are "grandpa style" mirrors?

The only power mirror option is the car-type or flag-style mirror. And no, a non-power version of that mirror doesn't magically become a power mirror just by running the wires. They look the same, but the manual mirrors have no motors. You need the actual power mirrors, the mirror/window/lock switch pad from a truck that had power mirrors, and the wiring harness that goes through the door bulkhead into the cab. If you can find a donor truck so equipped in a junkyard, that would be your best source.