The Ford F-8000 front and rear turn signal bulbs both utilize a 1157 size bulb for proper operation. The replacement chart covers vehicle production spanning 1983 to 1987.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 1157 is the sole bulb type listed for the Ford F-8000 across all recorded turn signal positions and model years in these specifications.
The 1157 is a dual-filament bulb, meaning it contains two separate filaments within a single envelope, allowing it to serve two distinct lighting functions from one unit.
It operates on a 12-volt electrical system and carries a wattage rating of 21W on its primary filament and 5W on its secondary filament, corresponding to brighter turn signal output and a lower-intensity running or parking light function respectively.
The 1157 uses a BAY15d bayonet base, which is an offset twin-pin base design. The offset pin placement is a deliberate anti-misalignment feature, ensuring the bulb can only be seated in one rotational orientation.
The 1157 carries ANSI standardization applicable in both the United States and Canada, indicating it conforms to a defined set of electrical and physical tolerances recognized across North America.
The front and rear turn signal positions on the Ford F-8000 share the same 1157 bulb specification across all listed years, indicating direct interchangeability between front and rear sockets provided the socket type is compatible.
The listed model years for the Ford F-8000 in these specifications are 1983, 1984, and 1987, with the 1157 specification applying uniformly to both turn signal positions in each of those years.