The Ford B-800F front turn signal uses a 1157 bulb size, while rear turn signal applications accommodate either 1156 or 1157 bulb sizes. The replacement chart covers 1995 through 1998 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 Ford B-800F uses the 1157 bulb for the front turn signal across all documented model years, spanning 1995-1998.
The 1157 is a dual-filament bulb rated at 12V with a 21W/5W output, meaning it draws 21 watts on its primary filament and 5 watts on its secondary filament, allowing it to serve both signaling and running light functions from a single unit.
The 1157 uses a BAY15d bayonet base, a two-pin offset base that physically prevents incorrect single-filament bulbs from being seated in its socket.
The rear turn signal on the Ford B-800F shifted from the 1157 in 1995 to the 1156 for the 1996-1998 model years, meaning the front and rear positions do not share the same bulb type for most of the documented range.
The 1156 is a single-filament bulb rated at 12V and 21W, dedicated solely to its primary function without a secondary filament for running light duty.
The 1156 uses a BA15s bayonet base, a single-pin base that is not interchangeable with the BAY15d base of the 1157, despite the two bulbs sharing the same 15mm base collar width.
Both the 1157 and 1156 are ANSI-standardized bulbs recognized across the United States and Canada, placing them within a widely distributed specification category.
Because the 1995 rear turn signal position calls for the 1157 rather than the 1156, substituting a 1156 in that socket for a 1995 model would result in a base mismatch due to the differing pin configurations of BA15s and BAY15d.