Triumph Bonneville front and rear turn signal bulbs utilize 232 and 5008 bulb sizes for replacement applications. The replacement chart covers vehicle production spanning 2001 through 2015 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 two bulb types specified across the Triumph Bonneville turn signal positions are the 232 and the 5008, both conforming to ANSI standards recognized in the United States and Canada.
The 232 is a festoon bulb, meaning it is cylindrical in form and held in place at each end rather than by a base socket. It uses an SV8.5 base and operates at 12V with a rated output of 3W.
The 5008 is a single-filament bulb fitted with a BA15s bayonet base, which uses a single locating pin to lock into its socket. It operates at 12V and is classified as a lower wattage variant of the 1156 bulb type.
Because the 5008 is a lower wattage variant of the 1156 and not electrically identical to it, substituting a standard 1156 in place of a 5008 would introduce a wattage mismatch that could affect turn signal circuit behavior.
The 232 festoon and the 5008 bayonet types use physically incompatible bases and are not interchangeable with each other, regardless of voltage rating.
On the Triumph Bonneville, the front and rear turn signal positions do not always share the same bulb type within a given model year. For example, the 2013 model year specifies a 5008 for the front position and a 232 for the rear, requiring two distinct bulb types to be stocked for a full replacement.
The front turn signal specification changed between 2014 and 2015, shifting from the 5008 to the 232, which represents a base type change from bayonet to festoon for that position.
Across the 2001-2015 model range, neither the front nor the rear turn signal position uses a single consistent bulb type throughout, meaning year-specific verification is necessary before replacement.