Ford Aerostar Parking Light Bulb Size

The Ford Aerostar parking light utilizes bulb sizes 3157NA, 1034NA, 1157NA, 2357, 2458, 3157, and 1157. Available data for bulb specifications covers the range from 1986 to 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

If US Type and EU Type show the same value, a direct cross-reference for this bulb is not available or the data is insufficient.

Years	US Type	EU Type	Shop
1997	3157NA	PY27/7W	Check Price
1994-1996	1034NA	1034NA	Check Price
1992-1993	1157NA	P21/5W	Check Price
1990-1991	2357	2357	Check Price
1988-1989	3157	P27/7W	Check Price
1986-1987	1157	P21/5W	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Dual-filament wedge bulb (T25), natural amber glass. 12V, 27W/7W.	3157NA	Check Price
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base, natural amber glass. Variant of 1157. 12V, 21/5W.	1034NA	Check Price
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base, natural amber glass. 12V, 21W/5W.	1157NA	Check Price
ECE standard (Europe & worldwide). Dual-filament signalling bulb with BAY15d bayonet base. 12V, 21W/5W.	P21/5W	Check Price
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. Brighter variant of 1157. 12V, 26.9W/8W.	2357	Check Price
ANSI standard (US & Canada). Dual-filament wedge bulb (T25). 12V, 27W/7W.	3157	Check Price
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. 12V, 21W/5W.	1157	Check Price

Other Locations

Additional Notes

The Ford Aerostar parking light specifications cover model years 1986-1997 and reference six distinct bulb sizes across that span: 1157, 1157NA, 1034NA, 2357, 3157, and 3157NA.
All six bulb types in these specifications conform to ANSI standards applicable in both the United States and Canada, and all operate at 12 volts.
Four of the six bulb types use a BAY15d bayonet base: the 1157, 1157NA, 1034NA, and 2357. The remaining two, the 3157 and 3157NA, are T25 wedge-base bulbs.
The 3157 and 3157NA are electrically identical at 27W/7W, with the only difference being that the 3157NA incorporates natural amber glass. The Ford Aerostar used the 3157 for the 1988-1989 model years and the 3157NA for 1997.
The 1157 and 1157NA share the same BAY15d base and the same 21W/5W power rating. The 1157NA adds natural amber glass. The Aerostar used the 1157 for 1986-1987, the 1157NA for 1992-1993, and the 1034NA, a variant of the 1157, for 1994-1996.
The 1034NA is described as a variant of the 1157NA, sharing its BAY15d base and natural amber glass, but rated at 21/5W rather than the 21W/5W of the 1157NA. These two types are not confirmed as interchangeable within these specifications.
The 2357 is a brighter variant of the 1157, sharing the BAY15d base but rated at 26.9W/8W compared to the 1157's 21W/5W. The Aerostar used the 2357 for the 1990-1991 model years.
The dual-filament design present in all six bulb types serves two functions within a single housing: the higher-wattage filament typically handles the turn signal or brake function, while the lower-wattage filament handles the parking light function.
Because the 3157 wedge base and the BAY15d bayonet base are physically incompatible, bulbs specified for 1988-1989 and 1997 cannot be substituted with bulbs specified for other years without a socket adapter or housing modification.
The 1990-1991 2357 bulb, while physically compatible with BAY15d sockets, draws noticeably more current than the 1157-family bulbs used in adjacent model years, which is a relevant consideration when evaluating cross-year substitution.