Ford F-7000 Back Up Light Bulb Size

Additional Notes

• The Ford F-7000 back up light specifications cover model years 1970 through 1987, with two bulb types appearing across that range: the 1156 and the 199.
• The 1156 is an ANSI-standard single-filament bulb rated at 12V and 21W, fitted with a BA15s bayonet base, and is the predominant bulb type across the Ford F-7000 specifications.
• The 199 is also an ANSI-standard single-filament bulb with a BA15s bayonet base, rated at 12V and 21W, and is classified as a variant of the 1156.
• The Ford F-7000 uses the 1156 exclusively for all back up light positions from 1979 through 1987.
• For model years 1970-1978, the specifications include duty-level designations, with some years listing different bulb types depending on whether the vehicle is Medium Duty or Medium/Heavy Duty.
• The 199 bulb is specified for Medium Duty configurations in 1970, 1971, 1973, and 1977, as well as for the Medium/Heavy Duty configuration in 1972.
• In 1970, 1971, and 1972, two separate bulb fitments are listed for the same model year, reflecting distinct duty-level variants of the F-7000 that take different bulbs.
• Although the 1156 and 199 share the same BA15s bayonet base, voltage, and wattage, they are listed as separate part numbers in the specifications, indicating that direct interchangeability between the two should not be assumed without confirming the correct fitment for a given duty configuration.