Renault Alliance Headlight Bulb Size

Renault Alliance headlight bulbs utilize H4666, H4651 for high beam and H4666, H4652, H4656 for low beam applications, with the bulb size specifications varying across production models. The replacement chart covers 1983 to 1987 model years and documents the corresponding bulb configurations for each vehicle generation.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

High Beam Headlight

Years	Bulb Size
1987	H4666
1983-1986	H4651

Low Beam Headlight

Years	Bulb Size
1987	H4666
1986	H4652
1985	H4656
1983-1984	H4652

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Rectangular sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H4666
ANSI standard (US & Canada). 4x6-inch rectangular sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H4651
ANSI standard (US & Canada). 4x6-inch rectangular sealed beam unit, variant of H4651. Not a replaceable bulb — the entire unit is replaced. 12V.	H4652
ANSI standard (US & Canada). 4x6-inch rectangular sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H4656

Other Locations

Additional Notes

The H4651, H4652, H4656, and H4666 bulb types specified for the Renault Alliance are all ANSI-standardized sealed beam units rated at 12V, meaning the entire headlight assembly is replaced as a single unit rather than an internal bulb being swapped out.
The H4651, H4652, and H4656 are all 4x6-inch rectangular sealed beam units, a format that was common in North American automotive lighting during this period and governed by ANSI standards applicable in both the United States and Canada.
The H4652 is a variant of the H4651, sharing the same 4x6-inch rectangular sealed beam format. Despite their close relationship, the two are distinct part numbers and are not listed interchangeably across all model years.
For the 1983-1986 Renault Alliance, the high beam headlight uses the H4651, while the low beam position uses either the H4652 or H4656 depending on the year, indicating that the two headlight positions did not share the same sealed beam unit during those years.
The 1985 Alliance low beam headlight specifies the H4656, which differs from the H4652 used in the 1983-1984 and 1986 model years for the same position, making the 1985 low beam fitment distinct within the 1983-1986 range.
The 1987 Renault Alliance uses the H4666 for both the high beam and low beam headlight positions, making it the only model year in the specifications where a single bulb type covers both functions.
The H4666 specified for the 1987 model year is a rectangular sealed beam unit conforming to ANSI standards, though it carries a different designation from the 4x6-inch units used in prior years, indicating it is not a direct substitute for the H4651, H4652, or H4656.