Mercury Lynx high and low beam headlight bulbs utilize 9004 or H6054 bulb sizes for this vehicle model. The replacement chart covers 1981 to 1987 production years 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.
The Mercury Lynx used two distinct headlight technologies across its production run, with the H6054 sealed beam unit fitted to 1981-1985 models and the 9004 halogen bulb fitted to 1986-1987 models.
The H6054 is a 5x7-inch rectangular sealed beam unit, meaning the lens, reflector, and filament are fused into a single glass assembly. When the filament fails, the entire unit requires replacement rather than just an internal bulb.
The 9004 is a dual-filament halogen bulb with a P29t base, operating at 12 volts with a rated output of 65 watts on high beam and 45 watts on low beam. A single bulb serves both beam functions through its two filaments.
On the Mercury Lynx, the 9004 bulb handles both high beam and low beam functions within one housing, which is a characteristic of single-unit dual-filament halogen systems.
The H6054 sealed beam unit similarly serves both high and low beam functions across 1981-1985 models, as the specifications list it identically for both sub-parts in those years.
Both the H6054 and the 9004 conform to ANSI standards recognized in the United States and Canada, indicating compliance with North American automotive lighting regulations.
The H6054 and 9004 are not interchangeable. The sealed beam format of the H6054 and the replaceable-bulb format of the 9004 represent fundamentally different headlight assembly designs requiring different housings.