The Merkur XR4Ti high beam and low beam headlight bulbs both use a 9004 bulb size. The replacement chart covers 1985 to 1989 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 9004 bulb is the sole headlight bulb type specified for the Merkur XR4Ti across all listed model years, covering both high beam and low beam functions for 1985-1989.
The 9004 is a dual-filament halogen bulb, meaning a single bulb unit contains two separate filaments: one rated at 65 watts for high beam output and one rated at 45 watts for low beam output.
Because the 9004 serves both the high beam and low beam positions in the XR4Ti, the vehicle does not use separate dedicated bulbs for each function.
The 9004 operates on a 12-volt electrical system, which is standard for passenger vehicles of this type.
The 9004 uses a P29t base, a specific connector type that is not interchangeable with other common halogen base types such as H4 or 9007, despite those bulbs also being dual-filament designs.
The 9004 conforms to ANSI standards applicable in the United States and Canada, indicating it meets the photometric and dimensional requirements established for those markets.