GMC K3500 Map Light Bulb Size

Additional Notes

• The GMC K3500 map light specifications cover model years 1993 through 2000, with two distinct bulb types used across that span: the 211-2 and the 168.
• The 211-2 is a festoon-type bulb with an SV8.5 base and a 41mm length, operating at 12 volts and 12 watts. It follows the ANSI standard applicable in both the United States and Canada.
• The 168 is a miniature wedge bulb of the T10 type, also rated at 12 volts but drawing only 4.9 watts. It likewise conforms to the ANSI standard for the US and Canadian markets.
• The two bulb types are not interchangeable. The 211-2 uses a festoon base (SV8.5) held in place by spring clips at each end, while the 168 uses a wedge base inserted directly into a socket, making the mounting mechanisms physically incompatible.
• The 211-2 and 168 also differ significantly in wattage, with the 211-2 drawing more than twice the power of the 168. This difference reflects distinct electrical load expectations in the circuits where each bulb is fitted.
• The GMC K3500 used the 211-2 bulb for the map light in 1994, 1997, 1999, and 2000.
• The 168 bulb was specified for the map light in the GMC K3500 for 1993, 1995, 1996, and 1998.
• The two bulb types alternate across the model year range without a single continuous block assigned to either type, indicating that the map light housing or circuit specification changed at multiple points during the production run.