The Pontiac T1000 high beam and low beam headlight bulbs both utilize the H6054 size. The replacement chart covers vehicle production spanning 1981 to 1987.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Pontiac T1000 uses the H6054 bulb size across both the high beam and low beam headlight positions for the entire 1981-1987 model range.
The H6054 is an ANSI-standardized sealed beam unit recognized in both the United States and Canada, meaning it conforms to a regulated specification rather than a proprietary design.
A sealed beam unit integrates the filament, reflector, and lens into a single non-serviceable assembly. When the filament fails, the entire unit is replaced rather than an individual bulb.
The H6054 unit is rectangular and measures 5x7 inches, a form factor shared with many other vehicles of the same era, which contributes to broad cross-vehicle interchangeability.
Because the T1000 uses the same H6054 for both high and low beam functions, the vehicle relies on the dual-filament design within that single sealed beam unit to serve both lighting modes.
The H6054 operates at 12 volts, consistent with the standard electrical system voltage found in passenger vehicles of this type.
The standardized ANSI designation of the H6054 means that compatible replacement units from multiple manufacturers are generally interchangeable, provided they carry the same H6054 designation.