Wiring Diagrams: 2004
WARNING: This page is about a different car, the 2004 Mazda MX-5 Miata, 2003 Mazda MX-5 Miata, and 2002 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.
For starter wiring diagram, see STARTING/CHARGING in SYSTEM WIRING DIAGRAMS article.