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What number is the alarm fuse in a 2003 ford EXPEDITION?

There isn't a single "alarm fuse" in a 2003 Ford Expedition. The alarm system's functions are controlled by several circuits, and thus, several fuses might be involved depending on what part of the alarm system is malfunctioning (horn, lights, sensors, etc.).

To find the relevant fuses, you need to consult your owner's manual. It will have a fuse box diagram showing which fuses control which circuits. Look for fuses related to:

* Horn: The alarm often uses the horn.

* Parking lights/Headlights: The alarm might flash these.

* Body control module (BCM): This module often manages the alarm system.

Without knowing the specific problem with your alarm, it's impossible to pinpoint the exact fuse(s). Check all fuses related to these circuits carefully, looking for any that are blown (broken filament).