Honda Motorcycle ST1300 front and rear turn signal bulbs both utilize a 7443 size bulb for proper operation. The replacement chart covers 2003 through 2012 model 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 Honda Motorcycle ST1300 uses the 7443 bulb in both the front and rear turn signal positions across all listed model years from 2003-2012.
The 7443 is an ANSI-standard bulb recognized in the US and Canada, classified under the T20 wedge form factor.
The 7443 operates on a 12-volt electrical system, which is standard for motorcycle applications in this class.
As a dual-filament bulb, the 7443 carries two separate wattage ratings: 21W for the high-intensity filament and 5W for the low-intensity filament, allowing it to serve more than one lighting function within a single housing.
The wedge base of the T20 form factor means the bulb is held in place by tension from the socket itself rather than by a bayonet or screw mechanism, which affects how it is seated and removed.
Because the same bulb type is specified for both front and rear positions on the Honda Motorcycle ST1300, a single replacement part covers all four turn signal housings on the motorcycle.
The 7443 and the closely related 7440 share the same T20 wedge base, but the 7440 is a single-filament bulb rated at 21W only. Substituting a 7440 for a 7443 would result in the loss of the secondary 5W filament function.
The uninterrupted use of the 7443 across the entire listed production span of the ST1300 indicates a consistent socket and housing specification throughout those model years, meaning a bulb sourced for one listed year is physically compatible with any other listed year.