Dodge W150 Back Up Light Bulb Size

The Dodge W150 back up light uses bulb size 1156, P21W, or 199 depending on the specific version required for the vehicle. Available data covers the range from 1977 through 1993 for the components listed in the provided 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
1979-1993	1156
1978	199
1977	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. Variant of 1156. 12V, 21W.	199

Other Locations

Additional Notes

The Dodge W150 uses the 1156 bulb as the back up light bulb for model years 1979-1993, with the sole exception of 1978, which uses the 199 bulb instead.
The 1156 is an ANSI-standardized bulb type recognized in both the United States and Canada, operating at 12 volts with a 21-watt output and a single filament.
The 1156 uses a BA15s bayonet base, a single-contact base type where the "s" denotes a single lug, meaning the bulb locks into its socket with one pin rather than two.
The 199 bulb, specified for the 1978 Dodge W150, shares the same BA15s bayonet base, 12-volt rating, 21-watt output, and single-filament construction as the 1156.
The 199 is classified as a variant of the 1156, and both carry ANSI standardization for the US and Canadian markets, indicating a close functional relationship between the two bulb types.
Because the 199 and 1156 share the same base type and electrical ratings, the physical and electrical interface with the socket is identical across all seventeen model years covered in these specifications.