Mercury Medalist front and rear turn signal bulbs both utilize a 1034 size bulb for proper operation. The replacement chart covers 1956 through 1958 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 1034 bulb is the sole turn signal bulb type listed for the Mercury Medalist across all documented model years and positions.
The 1034 is a dual-filament bulb, meaning it carries two separate filaments within a single envelope, one rated at 21 watts and one at 5 watts, allowing it to serve both a bright signaling function and a reduced-intensity function simultaneously.
The 1034 operates on a 12-volt electrical system, consistent with the standard automotive voltage adopted broadly during the mid-20th century.
Its base type is the BAY15d bayonet mount, a two-pin offset bayonet configuration in which the two pins are positioned at different heights to prevent incorrect insertion.
The 1034 is classified as an ANSI standard bulb recognized in both the United States and Canada.
The 1034 is described as a variant of the 1157 bulb. The 1157 is a widely available dual-filament bayonet bulb, and the 1034 shares its general design characteristics while differing in specific electrical ratings.
The Mercury Medalist (1956-1958) uses the same 1034 bulb specification for both the front and rear turn signal positions, indicating a uniform fitment across both lighting circuits.