Chevrolet Tiltmaster (W-Series) Back Up Light Bulb Size

Chevrolet Tiltmaster (W-Series) back up light bulbs use 1156 and 1073 sizes. The replacement chart covers 1986 to 2001 production years with corresponding bulb size specifications.

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
1996-2001	1156
1995	1073
1994	1156
1992-1993	1073
1986-1988	1156

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1156
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Lower wattage variant of 1156. 12V, 13W.	1073

Other Locations

Additional Notes

The Chevrolet Tiltmaster (W-Series) back up light specifications cover model years 1986-2001, with two distinct bulb sizes appearing across that span: the 1156 and the 1073.
Both the 1156 and 1073 are ANSI-standardized bulb types recognized in the United States and Canada, and both operate on a 12-volt electrical system with a single-filament design and a BA15s bayonet base.
The BA15s bayonet base is a single-contact base type, meaning the two bulbs share the same physical mounting interface despite differing in wattage output.
The 1156 is rated at 21 watts, while the 1073 is rated at 13 watts, making the 1073 a lower-output variant within the same base family.
Although the 1156 and 1073 share the BA15s base, their wattage difference represents a meaningful electrical distinction, and substituting one for the other without consulting vehicle-specific requirements is not advisable.
The 1156 bulb is specified for the 1986-1988, 1994, and 1996-2001 model years of the Tiltmaster (W-Series).
The 1073 bulb is specified for the 1992, 1993, and 1995 model years, indicating that the lower-wattage type was used during a specific period within the production run.
The 1995 model year uses the 1073, while the immediately adjacent years of 1994 and 1996 both use the 1156, reflecting a non-uniform fitment pattern across consecutive years.
The 1156 is the more frequently specified bulb across the Tiltmaster (W-Series) back up light data, appearing in nine of the thirteen listed model years.