Mitsubishi Diamante front and rear turn signal bulbs utilize 1156, 1156NA, 7440NA, and 3497 bulb sizes across different positions. The replacement chart covers 1992 through 2004 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 1156 bulb is the most frequently specified type across the Mitsubishi Diamante's turn signal positions, appearing in both the front and rear turn signal applications across multiple model years.
The 1156 is a single-filament bulb rated at 12V and 21W, fitted with a BA15s bayonet base, and meets ANSI standards for the US and Canadian markets.
The 1156NA shares the same 12V, 21W rating and BA15s bayonet base as the standard 1156, but its glass envelope is tinted natural amber rather than clear.
The Mitsubishi Diamante front turn signal uses the 1156 for the 1992-1994 and 1997-2004 model years, and the 1156NA for 1995-1996.
The natural amber glass of the 1156NA produces an amber-colored output without relying on a colored lens, which affects how the bulb functions in housings designed around that characteristic.
The 3497 is a variant of the 1156 and shares the same 12V, 21W output and BA15s bayonet base, though it carries a distinct ANSI designation.
The rear turn signal on the Diamante uses the 3497 for 1997-2001, making it a separate fitment from the 1156 used in the rear position for 1992-1996, despite their close technical relationship.
The 7440NA is a T20 wedge-base bulb rated at 12V and 21W with natural amber glass, and it differs from the BA15s bayonet-base types in its mounting interface, making it physically incompatible with sockets designed for bayonet-base bulbs.
The rear turn signal on the 2002-2004 Diamante uses the 7440NA, representing a shift in base type relative to all prior rear turn signal fitments listed in the specifications.
All four bulb types listed across both turn signal positions share the same 12V, 21W electrical rating, though their base types and glass treatments differ in ways that affect direct interchangeability.