Ford Excursion Dome Light Bulb Size

The Ford Excursion dome light requires a 921 bulb size for proper installation and function within the interior overhead lighting system. Available data covers the 2000 to 2005 range for the specified vehicle and component.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
2000-2005	921

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W.	921

Other Locations

Additional Notes

The Ford Excursion uses the 921 bulb for the dome light across all model years from 2000-2005.
The 921 is an ANSI-standardized bulb type, meaning its specifications are governed by a recognized North American standard shared across the United States and Canada.
The 921 bulb uses a wedge-style base, designated T15, which refers to a tubular glass envelope roughly 15/8 of an inch wide that is held in place by tension against the socket rather than by pins or a bayonet mechanism.
The 921 operates at 12 volts, consistent with the standard electrical system voltage found in passenger vehicles.
The 921 is rated at 16 watts, placing it in a moderate output range typical of interior dome lighting applications.
Because the 921 fitment is uniform across the entire 2000-2005 Ford Excursion production run, a single bulb specification applies regardless of model year within that range.
The T15 wedge base of the 921 is not interchangeable with bayonet-base or pin-base bulb types, and socket compatibility depends on the wedge form factor specifically.