Ford Aerostar License Plate Bulb Size

The Ford Aerostar license plate light requires 168 and 194 bulb sizes for the exterior illumination system. Available data covers the production span from 1986 through 1997.

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
1990-1997	168
1986-1989	194

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 4.9W.	168
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 3.78W.	194

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Additional Notes

The Ford Aerostar uses two distinct bulb sizes for the license plate position across its production run: the 168 and the 194, both of which are ANSI-standardized miniature wedge bulbs classified under the T10 form factor.
The 1990-1997 model years of the Ford Aerostar specify the 168 bulb for the license plate position, while the 1986-1989 model years specify the 194 bulb.
Both the 168 and 194 bulbs operate on a 12-volt electrical system, which is standard for automotive applications of this type.
Although the 168 and 194 share the same T10 wedge base and voltage rating, they are not identical in power draw. The 168 is rated at 4.9 watts, while the 194 draws 3.78 watts, making them electrically distinct despite their physical similarities.
The shared T10 wedge base between the 168 and 194 means the two bulbs are physically interchangeable in terms of socket fitment, but the difference in wattage means the electrical load delivered to the circuit will vary depending on which bulb is installed.
Both bulb sizes conform to ANSI standards recognized in the United States and Canada, indicating consistent performance and sizing specifications across compliant manufacturers.