The Triumph Scrambler high beam and low beam headlight bulbs both utilize a 9003 bulb size. The replacement chart covers vehicle production spanning 2006 to 2017.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Triumph Scrambler uses the 9003 bulb type for both high beam and low beam headlight positions across the 2006-2017 model years.
The 9003 is an ANSI-standard designation recognized in the United States and Canada, making it the North American equivalent of the internationally designated H4 bulb.
As a dual-filament halogen bulb, the 9003 houses both the high and low beam light sources within a single glass envelope, which is why one bulb size serves both headlight functions on the Triumph Scrambler.
The 9003 operates on a 12-volt electrical system and draws 60 watts on the high beam filament and 55 watts on the low beam filament.
The bulb uses a P43t base, a bayonet-style mount with a 43mm collar, which physically determines socket compatibility and is not interchangeable with other base types regardless of similar voltage or wattage ratings.
Because a single bulb type governs both beam functions, replacing one filament failure requires substituting the entire dual-filament unit rather than a beam-specific component.
The uninterrupted use of the 9003 specification across all twelve model years on the Triumph Scrambler indicates a consistent headlight housing design throughout that production period.