The BMW L7 uses a 3893 bulb size for both front and rear side marker applications. The replacement chart covers 1986 to 1987 model production years with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The BMW L7 uses the 3893 bulb across both the front and rear side marker positions for the 1986-1987 model years.
The 3893 is an ANSI-standardized bulb, meaning its specifications are governed by a recognized North American standard applicable in both the United States and Canada.
The 3893 is a dual-filament bulb, which means it contains two separate filaments within a single envelope, allowing it to serve more than one lighting function.
The 3893 uses a BAY15d bayonet base, a two-pin offset base type where the two pins are positioned at different heights to ensure the bulb is inserted in only one orientation, preventing incorrect filament alignment.
The 3893 operates at 12 volts, consistent with the standard electrical system voltage found in passenger vehicles of this era.
The 3893 is classified as a specialty application bulb, indicating it is not among the most widely distributed bulb types and may have more limited retail availability than common automotive bulbs.
The front and rear side marker positions on the BMW L7 share the same bulb type for both model years covered, meaning a single bulb specification applies to all four side marker sockets on the vehicle.
The BAY15d base is distinct from the single-pin BA15s base; substituting a single-filament BA15s bulb in a BAY15d socket would result in an improper fit and is not interchangeable.