Ford F-700 front and rear turn signal bulbs utilize 1157, 1156, and 199 bulb sizes across multiple applications. The replacement chart covers vehicle production spanning 1970 to 1998.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Ford F-700 turn signal bulb specifications cover model years 1970 through 1998, spanning both front and rear positions across the vehicle's production run.
The 1157 is the most frequently specified bulb across both positions. It is a dual-filament bulb operating at 12V with a 21W main filament and a 5W secondary filament, fitted with a BAY15d bayonet base, and recognized under ANSI standards in the US and Canada.
The 1156 and 199 are both single-filament bulbs rated at 12V and 21W, each using a BA15s bayonet base. The 199 is classified as a variant of the 1156 under ANSI standards.
Because the 1157 uses a BAY15d base and the 1156 and 199 use a BA15s base, these bulb types are not physically interchangeable despite sharing the same voltage rating and similar wattage.
The front turn signal position on the Ford F-700 uses the 1157 for all model years from 1970 through 1998, with the exception of 1973 and 1975, which specify the 199.
The rear turn signal position shows variation between the 1157, 1156, and 199 across different model years, making the rear position more sensitive to year-specific fitment than the front.
The 199 bulb appears only in the front turn signal for 1973 and 1975, and in the rear turn signal for 1971, representing isolated year-specific fitments rather than a sustained specification.
The dual-filament design of the 1157 allows it to serve both a brighter turn signal function and a lower-intensity running or parking light function through its two separate filaments within a single bulb envelope.
The single-filament design of the 1156 and 199 means each bulb serves only one lighting function, which is relevant to how the rear turn signal circuit is configured in the years those bulbs are specified.
All three bulb types in these specifications conform to ANSI standards applicable in the US and Canada, indicating standardized electrical and physical characteristics within those markets.