Ford Explorer Seat Belt Warning Bulb Size

The Ford Explorer seat belt warning light utilizes bulb sizes PC74, PC194, and 37 depending on the specific version of the vehicle. Available data for the bulb sizes covers the range from 1991 to 2005.

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
2002-2005	PC74
2001	PC194
1991-2000	37

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T5) with printed circuit board twist-lock socket, for instrument clusters. 12V, 1.4W.	PC74
ANSI standard (US & Canada). Miniature wedge bulb (T10) with printed circuit board twist-lock socket, for instrument clusters. 12V, 3.78W.	PC194
ANSI standard (US & Canada). Miniature wedge bulb (T5). 12V, 1W.	37

Other Locations

Additional Notes

The Ford Explorer seat belt warning bulb specifications span model years 1991 through 2005, covering three distinct bulb types across that range.
The bulb type 37 is the most frequently specified across this vehicle, covering model years 1991-2000. It is an ANSI-standard miniature wedge bulb in a T5 envelope, rated at 12V and 1W.
The PC74 bulb is specified for the Ford Explorer across model years 2002-2005. It is also an ANSI-standard T5 miniature wedge bulb, but it uses a printed circuit board twist-lock socket and draws 1.4W at 12V, distinguishing it from the type 37 despite sharing the same T5 envelope.
Although the type 37 and PC74 bulbs share a T5 envelope form factor, their socket types differ. The type 37 uses a standard wedge base, while the PC74 uses a printed circuit board twist-lock socket, making them non-interchangeable in practice.
The PC194 bulb is specified solely for the 2001 model year. It is a T10 miniature wedge bulb with a printed circuit board twist-lock socket, rated at 12V and 3.78W, making it the highest-wattage bulb among the three types listed.
The PC194 is a T10 envelope, which is physically larger than the T5 envelope used by both the type 37 and PC74. This size difference means the PC194 is not interchangeable with the bulbs specified for surrounding model years.
All three bulb types listed carry ANSI standard designations applicable in both the United States and Canada, indicating standardized electrical and physical ratings across those markets.
The PC74 and PC194 bulbs are both designed specifically for instrument cluster applications and use a twist-lock printed circuit board socket, a mounting style distinct from the conventional wedge base of the type 37.