GMC C1500 Map Light Bulb Size

The GMC C1500 map light uses bulb sizes 168, 561, and 211-2 depending on the specific version required for the interior lighting component. Data for the listed specifications covers the period from 1993 through 1999.

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
1999	168
1998	561
1996-1997	211-2
1995	168
1994	211-2
1993	168

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 4.9W.	168
ANSI standard (US & Canada). Festoon bulb, 44mm length, end-cap contacts. 12V, 12W.	561
ANSI standard (US & Canada). Festoon bulb, 41mm length, SV8.5 base. 12V, 12W.	211-2

Other Locations

Additional Notes

The GMC C1500 map light draws from three distinct bulb types across its 1993-1999 model years: the 168, 561, and 211-2.
The 168 is a T10 miniature wedge bulb rated at 12V and 4.9W, conforming to ANSI standards for the US and Canadian markets.
The 561 is a festoon-style bulb measuring 44mm in length with end-cap contacts, rated at 12V and 12W, also under ANSI standards.
The 211-2 is a festoon-style bulb measuring 41mm in length with an SV8.5 base, rated at 12V and 12W, likewise conforming to ANSI standards.
The GMC C1500 uses the 168 bulb for the 1993, 1995, and 1999 model years.
The 211-2 bulb is specified for the 1994, 1996, and 1997 model years.
The 561 bulb is specified exclusively for the 1998 model year.
Although the 561 and 211-2 share the same voltage and wattage ratings, their physical forms differ: the 561 is 44mm with end-cap contacts, while the 211-2 is 41mm with an SV8.5 base, making them non-interchangeable.
The 168 wedge bulb operates at 4.9W, notably lower than the 12W output of both festoon types, reflecting a fundamental difference in bulb construction and socket design.
The variation in bulb type across model years indicates that the C1500 map light housing or socket specification changed at least twice during the 1993-1999 production run.