AM General Hummer front and rear turn signal bulbs utilize a 1157 bulb size across both locations. The replacement chart covers vehicle production spanning 1992 to 2001.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The AM General Hummer uses the 1157 bulb for both its front and rear turn signals across the 1992-2001 model years.
The 1157 is a dual-filament bulb, meaning it contains two separate filaments within a single glass envelope, allowing it to serve two distinct lighting functions at different wattages.
The 1157 operates at 12 volts, which is standard for automotive electrical systems of this type.
Its two filaments are rated at 21W and 5W respectively, with the higher-wattage filament typically handling the turn signal or brake function and the lower-wattage filament handling the running light function.
The 1157 uses a BAY15d bayonet base, which is an offset dual-contact base design that prevents incorrect installation by ensuring the bulb can only be seated in one orientation.
The 1157 conforms to ANSI standards and is recognized in both the United States and Canada, indicating a standardized specification shared across North American automotive applications.
Because the same 1157 bulb is specified for both the front and rear turn signal positions on the AM General Hummer, a single bulb type serves both locations without substitution.