The Triumph Rocket III uses 5008 and 232 bulb sizes for both front and rear turn signal applications. A replacement chart documents bulb specifications across the 2004 to 2010 production range.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 5008 is the most frequently specified bulb across both front and rear turn signal positions on the Triumph Rocket III, appearing in the majority of model years from 2004-2010.
The 5008 is a single-filament, 12-volt bulb with a BA15s bayonet base, classified under ANSI standards for the US and Canadian markets. It is a lower wattage variant of the 1156 bulb, sharing the same base type but drawing less power.
The 232 is a 12-volt, 3-watt festoon bulb with an SV8.5 base, also ANSI-rated for US and Canadian markets. Its festoon form factor and base type differ entirely from the BA15s bayonet configuration of the 5008.
The 5008 and 232 are not interchangeable. The BA15s bayonet base of the 5008 and the SV8.5 festoon base of the 232 are physically incompatible, and their wattage ratings also differ.
The front turn signal on the 2006 Triumph Rocket III uses the 232 bulb, while all other listed model years from 2004-2010 use the 5008 for that position.
The rear turn signal on the 2008 Triumph Rocket III uses the 232 bulb, while all other listed model years from 2004-2010 use the 5008 for that position.
The front and rear turn signals do not share the same bulb type across all years. The 2006 front and 2008 rear positions each call for the 232, meaning the front and rear specifications diverge in those respective years.