Honda Motorcycle VF1100C V65 Magna Turn Signal Bulb Size
Honda Motorcycle VF1100C V65 Magna front turn signal bulbs use 1034 size while rear turn signal bulbs use P21W size. The replacement chart covers 1983 to 1986 production years with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Honda Motorcycle VF1100C V65 Magna uses two distinct bulb types across its turn signal positions: the 1034 for the front and the P21W for the rear, across the full 1983-1986 model range.
The 1034 bulb follows the ANSI standard, which governs bulb specifications in the United States and Canada, while the P21W follows the ECE standard used in Europe and other international markets.
The 1034 is a dual-filament bulb, meaning it contains two separate filaments within a single envelope, rated at 12V with a 21/5W output reflecting its two operating wattages.
The P21W is a single-filament bulb rated at 12V and 21W, a configuration typical of dedicated turn signal or brake light applications that require only one function per bulb.
The 1034 uses a BAY15d bayonet base, which is an offset twin-pin fitting designed to prevent incorrect installation by ensuring the bulb can only be seated in one orientation.
The P21W uses a BA15s bayonet base, a single-pin fitting that differs structurally from the BAY15d base of the 1034, making the front and rear bulbs non-interchangeable despite sharing the same 12V operating voltage.
The 1034 is described as a variant of the 1157, a widely used automotive bulb, though the two are not identical and substitution between them warrants verification of fitment compatibility before use.
The base type difference between the front and rear bulbs, BAY15d versus BA15s, reflects the functional difference between a dual-filament front position and a single-filament rear signal application.