Section 164 (System Wiring Diagrams - F150): Radio
WARNING: This page is about a different car, the 2003 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: MP3 Player Circuit
Fig 2: Radio Circuit, Except Supercrew
Fig 3: Radio Circuit, Harley-Davidson
Fig 4: Radio Circuit, Supercrew W/ Rear Entertainment (1 of 2)
Fig 5: Radio Circuit, Supercrew W/ Rear Entertainment (2 of 2)
Fig 6: Radio Circuit, Supercrew W/O Rear Entertainment