Wiring Diagrams: 2003
WARNING: This page is about a different car, the 2004 Ford Focus and 2003 Ford Focus. However, it is still accessible from the selected car via links, so may be relevant.
For starting system wiring diagrams, see STARTING/CHARGING in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
For power distribution system wiring diagrams, see POWER DISTRIBUTION in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.