Ford F-250 Ash Tray Bulb Size

The Ford F-250 ash tray utilizes bulb sizes 161, 37, 1892, and 1445 depending on the specific vehicle configuration. Available data covers the range from 1969 to 1999.

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
1999	161
1997-1998	37
1988-1996	161
1985-1986	1892
1975-1979	1892
1969-1972	1445

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 1W.	161
ANSI standard (US & Canada). Miniature wedge bulb (T5). 12V, 1W.	37
ANSI standard (US & Canada). Miniature wedge bulb (T5). 12V, 3W.	1892
ANSI standard (US & Canada). Single-filament bulb with BA9s base. 12V, 2W.	1445

Other Locations

Additional Notes

The Ford F-250 ash tray bulb specifications cover model years 1969 through 1999, with four distinct bulb types used across that span: 161, 37, 1892, and 1445.
The bulb 161 is the most frequently specified type across the Ford F-250 ash tray application, covering model years 1988-1996 and 1999, with the exception of 1997 and 1998.
The 161 is an ANSI-standard miniature wedge bulb in a T10 form factor, rated at 12V and 1W.
The bulb 37 is specified for the Ford F-250 for model years 1997-1998. It is also an ANSI-standard miniature wedge bulb, but in the smaller T5 form factor, rated at 12V and 1W.
Although the 161 and 37 share the same 12V, 1W electrical rating, they use different form factors, T10 and T5 respectively, meaning they are not physically interchangeable despite identical wattage.
The bulb 1892 is specified for model years 1975-1979 and 1985-1986. It is an ANSI-standard T5 miniature wedge bulb rated at 12V and 3W, drawing three times the wattage of the 37 bulb despite sharing the same T5 form factor.
Because the 1892 and 37 share a T5 form factor but differ in wattage, 3W versus 1W, substituting one for the other carries a risk of electrical incompatibility with the socket or circuit design of a given model year.
The bulb 1445 is specified for model years 1969-1972. Unlike the wedge-base bulbs used in all other listed years, the 1445 uses a BA9s bayonet-style base with a single filament, rated at 12V and 2W.
The BA9s base of the 1445 is a physically distinct mounting type from the wedge bases used by the 161, 37, and 1892 bulbs, making it incompatible with sockets designed for any of those three types.
All four bulb types listed in these specifications conform to ANSI standards applicable in both the United States and Canada.