The Indian Chief Dark Horse uses 1156 bulb size for both front and rear turn signal applications. The replacement chart covers 2010 through 2013 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 1156 is the most frequently specified bulb type across these turn signal applications, appearing in both front and rear positions for the Indian Chief Dark Horse across the 2010-2013 model years.
The 1156 bulb follows the ANSI standard, which is the American National Standards Institute classification system used to define consistent electrical and physical characteristics for bulbs sold in the United States and Canada.
The 1156 operates on a 12-volt electrical system and draws 21 watts, which is typical for incandescent turn signal applications on motorcycles of this era.
The 1156 uses a BA15s bayonet base, a single-contact fitting where the "s" denotes a single pin, distinguishing it from the BA15d double-contact variant with which it is not interchangeable.
Because the 1156 is a single-filament bulb, it serves one dedicated function per socket, unlike dual-filament types such as the 1157, which combine two functions in one housing.
The front and rear turn signal positions on the Indian Chief Dark Horse share the same 1156 bulb specification across all listed model years, meaning both positions draw from an identical replacement part.