Ford Aerostar Instrument Panel Bulb Size

The Ford Aerostar instrument panel utilizes bulb sizes 194, 161, and 37 across various production versions of the vehicle. Available information covers the span of time 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
1997	194
1994-1996	161
1993	161 (With Digital Inst. Cluster)
1990-1992	194
1989	37
1986-1988	194

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 3.78W.	194
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 1W.	161
ANSI standard (US & Canada). Miniature wedge bulb (T5). 12V, 1W.	37

Other Locations

Additional Notes

The Ford Aerostar instrument panel draws from three distinct bulb sizes across its model years: the 194, 161, and 37, all of which conform to ANSI standards recognized in both the United States and Canada.
The 194 bulb is the most frequently specified type in the Ford Aerostar instrument panel, appearing across 1986-1992 and again in 1997, making it the dominant fitment across the vehicle's production span.
The 194 is a T10 miniature wedge bulb rated at 12V and 3.78W, giving it a notably higher wattage output than the other two bulb types listed in these specifications.
The 161 bulb shares the same T10 miniature wedge form factor as the 194 but operates at a significantly lower wattage of 1W, making the two bulbs physically interchangeable in their socket type while differing in light output.
Because the 194 and 161 share the T10 wedge base, substituting one for the other is physically possible, though the difference in wattage (3.78W versus 1W) means brightness output would not be equivalent.
The 161 bulb is specified for the 1993-1996 model years, with the 1993 entry carrying an explicit notation that this fitment applies to vehicles equipped with the Digital Instrument Cluster.
The 1993 Digital Instrument Cluster notation indicates that instrument cluster configuration is a relevant variable in determining the correct bulb fitment for that model year.
The 37 bulb, specified solely for the 1989 Ford Aerostar, uses a T5 miniature wedge base rather than the T10 base found on both the 194 and 161, making it physically incompatible with sockets designed for those two bulb types.
The 37 bulb shares the 1W rating of the 161 but differs in base size, as the T5 form factor is smaller than the T10, and the two cannot be used interchangeably despite the identical wattage.
The 1989 model year stands as the only year in these specifications where a T5 wedge base bulb is required, setting it apart from all other listed Aerostar model years, which use T10-based bulbs.