GMC W7500 Forward Turn Signal Bulb Size

The GMC W7500 Forward uses front and rear turn signal bulbs in sizes 1073, 2057, and 1157. The replacement chart covers vehicle production years from 1984 to 1996 with corresponding bulb size specifications.

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

Front Turn Signal

YearsBulb Size
1995-19961073 (Tiltmaster)
1993-19942057 (Tiltmaster)
19922057 (Medium Duty)
1073 (Tiltmaster)
19912057
19901157 (Medium Duty)
1073 (Tiltmaster)
19891157 (Medium Duty)
2057 (Tiltmaster)
19881157 (Medium Duty)
1073 (Tiltmaster)
19871073
1157 (Medium Duty)
2057 (With 2 Round Headlamps)
19862057
1157 (Medium Duty)
1073 (With 4 Round Headlamps)
19851073
2057
19841157 (Medium Duty)
2057 (Tiltmaster)

Rear Turn Signal

YearsBulb Size
1995-19961073 (Tiltmaster)
1993-19942057 (Tiltmaster)
1990-19921157 (Medium Duty)
1073 (Tiltmaster)
19892057 (Medium Duty)
1073 (Tiltmaster)
19881157 (Medium Duty)
2057 (Tiltmaster)
1985-19871073
1157 (Medium Duty)
2057 (With 2 Round Headlamps)
19842057

Bulb Specifications

Description Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Lower wattage variant of 1156. 12V, 13W.1073
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. Brighter variant of 1157. 12V, 26.9W/8W.2057
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. 12V, 21W/5W.1157

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