Nissan Altra EV front turn signal bulbs use P21W size while rear turn signal bulbs use 7440 size. The replacement chart covers 1999 to 2001 model 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 Nissan Altra EV uses two distinct turn signal bulb types across its front and rear positions for the 1999-2001 model years, with each position standardized to a single bulb type throughout that entire production span.
The front turn signal on the Nissan Altra EV takes the P21W bulb, an ECE-standard type recognized across European and worldwide automotive markets.
The P21W operates at 12V and 21W, uses a single filament, and mounts via a BA15s bayonet base, which requires a twist-and-lock insertion rather than a straight push-fit.
The rear turn signal across all three model years uses the 7440 bulb, an ANSI-standard type common in the United States and Canada.
The 7440 is a T20 wedge-base bulb, meaning it seats through friction rather than a bayonet mechanism, and it also operates at 12V and 21W with a single filament.
Although the P21W and 7440 share identical wattage and voltage ratings, their base types are physically incompatible, making them non-interchangeable between the front and rear positions.
The regulatory standards behind these two bulbs reflect a regional divide: the ECE standard governs the P21W for international markets, while the ANSI standard governs the 7440 for North American markets.
Both bulbs carry a single-filament design, which is consistent with dedicated turn signal applications where a separate circuit handles each lighting function rather than a shared dual-filament arrangement.