The GMC V2500 Suburban uses a 168 bulb size for front side marker lights and a 194 bulb size for rear side marker bulbs. The replacement chart covers vehicle production years spanning 1987 to 1991.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The GMC V2500 Suburban uses two distinct bulb sizes for its side marker lights across the 1987-1991 model years, with the front and rear positions requiring different bulbs.
The front side marker position on the V2500 Suburban calls for a size 168 bulb across all 1987-1991 model years.
The rear side marker position on the V2500 Suburban calls for a size 194 bulb across all 1987-1991 model years.
Both the 168 and 194 bulbs conform to ANSI standards recognized in the United States and Canada, placing them within a regulated specification framework for electrical and photometric performance.
Both bulbs share the T10 miniature wedge form factor, a baseless design where the glass envelope itself is pressed into the socket, eliminating the need for a separate metal base.
Both bulbs operate on a 12-volt circuit, consistent with the standard electrical architecture of automotive lighting systems.
The 168 bulb carries a rated wattage of 4.9W, while the 194 bulb is rated at 3.78W, making the rear marker slightly lower in power consumption than the front.
Although the 168 and 194 bulbs share the same T10 wedge form factor and 12-volt rating, their wattage ratings differ, and the two sizes are not interchangeable without accounting for that difference.