Ford B-600 Parking Brake Indicator Bulb Size

The Ford B-600 parking brake indicator bulb uses 194 and 37 sizes for replacement applications. The replacement chart covers vehicle production spanning 1989 to 1994.

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
1993-1994	194
1992	37
1989-1991	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 (T5). 12V, 1W.	37

Other Locations

Additional Notes

The Ford B-600 parking brake indicator uses two distinct bulb types across the 1989-1994 model years: the 194 and the 37.
The 194 bulb is an ANSI-standard miniature wedge type in a T10 form factor, rated at 12V and 3.78W.
The 37 bulb is also an ANSI-standard miniature wedge type, but in the smaller T5 form factor, rated at 12V and only 1W.
The T10 and T5 designations refer to the width of the wedge base, with T10 being physically larger than T5, making the two bulbs non-interchangeable despite sharing the same voltage rating.
The 194 bulb draws 3.78W, while the 37 bulb draws 1W, representing a notable difference in power consumption between the two types.
The Ford B-600 uses the 194 bulb for the parking brake indicator in the 1989-1991 and 1993-1994 model years.
The 1992 Ford B-600 uses the 37 bulb for the parking brake indicator, which differs from all other years covered in the specifications.
Both bulb types conform to ANSI standards applicable in the United States and Canada.