GMC W7500 Forward Side Marker Bulb Size

The GMC W7500 Forward uses 194 and 1157 bulb sizes for front side marker applications, with 194 bulbs specified for rear side marker positions. The replacement chart covers vehicle production spanning 1984 to 1996.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Front Side Marker

YearsUS TypeEU TypeShop
1993-1996194 (Tiltmaster)W5WCheck Price
1990-19921157 (Medium Duty)P21/5WCheck Price
194 (Tiltmaster)W5WCheck Price
1989194W5WCheck Price
1988194W5WCheck Price
1157 (Medium Duty)P21/5WCheck Price
1985-1987194W5WCheck Price
1984194W5WCheck Price
1157 (Medium Duty)P21/5WCheck Price

Rear Side Marker

YearsUS TypeEU TypeShop
1993-1995194W5WCheck Price
1988-1992194 (Medium Duty)W5WCheck Price
1985-1987194W5WCheck Price
1984194 (Medium Duty)W5WCheck Price

Bulb Specifications

Description Type Shop
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 3.78W.194Check Price
ECE standard (Europe & worldwide). Single-filament signalling bulb with W2.1x9.5d wedge base. 12V, 5W.W5WCheck Price
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. 12V, 21W/5W.1157Check Price
ECE standard (Europe & worldwide). Dual-filament signalling bulb with BAY15d bayonet base. 12V, 21W/5W.P21/5WCheck Price

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