* Consulting a 1992 Ford Explorer 4.0L repair manual: These manuals usually have diagrams showing the firing order and coil pack wire locations.
* Looking at the engine itself: The wires may be numbered directly, or you might find a diagram stamped on the valve cover or a nearby component.
* Tracing the wire: Follow the wire from the number 1 spark plug to the coil pack. This is the most reliable method.
Important: Don't rely solely on online images as coil pack positions can vary slightly between models. Always double-check using your vehicle's specific repair manual or by physically tracing the wires.