Where is wiper relay switch on 2005 ford f-150?

The wiper relay on a 2005 Ford F-150 is typically located in the underhood fuse box, also known as the Power Distribution Box (PDB). It's not a switch; it's a relay that receives a signal from the wiper switch and then activates the wiper motor.

You'll need to consult your owner's manual or a wiring diagram for the exact location within that fuse box. The diagram will usually show the relay's location and number. The fuse box cover itself may have a legend showing the locations of various fuses and relays.