Autocar S License Plate Bulb Size

The Autocar S license plate light requires a 198 bulb size for proper illumination of the rear identification area. Data for the specific component covers the period from 1981 to 1983.

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
1981-1983	198

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T5). 12V, 2W.	198

Other Locations

Additional Notes

The 1981-1983 Autocar S uses the 198 bulb for the license plate position across all three model years listed.
The 198 is an ANSI-standardized bulb type recognized in both the United States and Canada, operating at 12 volts and 2 watts.
The T5 designation refers to a tubular bulb with a width of 5/8 inch, housed in a miniature wedge base, which requires no socket twist to install and is retained by friction alone.
At 2 watts, the 198 draws minimal current, a characteristic typical of license plate lighting, where output requirements are low and heat generation is a concern in enclosed housings.
The wedge base format of the 198 means it is not interchangeable with bayonet or screw-base miniature bulbs, even when voltage and wattage ratings are otherwise similar.