The Ford F-7000 front turn signal bulb size measures 1157 or 1156, while rear turn signal bulb size measures 1157 or 199. The replacement chart covers 1970 through 1987 production 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 1157 is the dominant bulb type across the Ford F-7000 turn signal specifications, appearing in both front and rear positions across the majority of model years from 1970-1987.
The 1157 is a dual-filament bulb rated at 12V with a 21W main filament and a 5W secondary filament, mounted on a BAY15d bayonet base, which allows it to serve both turn signal and running light functions within a single housing.
The 1156 is a single-filament bulb rated at 12V, 21W, and uses a BA15s bayonet base. Its base type differs from the 1157's BAY15d base, meaning the two bulbs are not interchangeable despite their similar appearance and wattage on the primary filament.
The Ford F-7000 front turn signal for the 1980 model year specifies the 1156 rather than the 1157, making it the only front position entry across the entire 1970-1987 span to use a single-filament bulb in that location.
The 199 is a single-filament bulb rated at 12V, 21W, sharing the BA15s bayonet base with the 1156 and classified as a variant of it under the ANSI standard.
Because the 199 and 1156 share the same BA15s base and electrical ratings, they are generally considered cross-compatible in applications where either is specified.
The rear turn signal for the Ford F-7000 lists dual bulb entries for the 1972 model year, specifying the 1157 for Medium/Heavy Duty configurations and the 199 for Medium Duty configurations, indicating that the correct bulb depends on the truck's duty rating.
A similar split applies to the 1970 rear turn signal, where the 199 is specified for Medium Duty and the 1157 for Medium/Heavy Duty, reinforcing that duty classification is a relevant fitment factor for certain model years.
Front turn signal entries for 1973-1978 carry a Medium Duty designation alongside the 1157 specification, while entries from 1970-1972 and 1979-1987 carry no such qualifier in that position.
All three bulb types listed in the specifications, the 1157, 1156, and 199, conform to ANSI standards applicable in both the United States and Canada.