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Dome Light Assembly – 1975-1979 Ford F-150 Truck

Updated June 24, 2026

This dome light assembly is a direct replacement for the interior overhead light in 1975-1979 Ford F-150 trucks. It includes the translucent lens and a compatible light bulb, restoring full illumination to the cab for entry, exit, and general interior visibility. The assembly mounts flush to the headliner and is activated by the door switches or a manual slide/rocker switch on the unit itself.

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Function and Design

The dome light serves as the primary interior courtesy lamp, illuminating the cab when doors are opened or when the manual switch is turned on. This assembly uses a single incandescent bulb (included) housed behind a translucent lens that diffuses light evenly. The lens is typically made of plastic or glass and clips into the metal or plastic housing. The unit connects to the truck's existing wiring via a two-wire pigtail and grounds through the mounting screws or a dedicated ground wire.

Vehicle Fitment

This dome light assembly is designed specifically for 1975-1979 Ford F-100, F-150, F-250, and F-350 trucks. It fits both standard cab and SuperCab body styles. The mounting hole pattern and electrical connector match the factory configuration for these model years. It is not compatible with earlier or later Ford truck generations without modification.

Installation Notes

Installation is straightforward: remove the old dome light by prying off the lens (if still present) and unscrewing the housing from the headliner. Disconnect the wiring harness, then connect the new assembly and secure it with the original screws. Ensure the ground connection is clean and tight to prevent flickering. The included bulb is pre-installed; if upgrading to LED, verify polarity and resistor compatibility to avoid hyperflash or dim operation.

Common Failure Symptoms and Diagnosis

Symptoms of a failing dome light assembly include the light not turning on when doors open, intermittent operation, or a flickering bulb. Often the issue is a burned-out bulb, corroded contacts, or a broken ground. If the bulb tests good but the light still fails, check the door jamb switches and the fuse. The lens may also become yellowed or cracked over time, reducing light output. Replacing the entire assembly restores both function and appearance.

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Frequently asked questions

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Will this dome light fit a 1977 Ford F-250?

Yes, this assembly fits all 1975-1979 Ford F-Series trucks including F-250 models. The mounting and wiring are identical across the range.

Does the assembly include the bulb?

Yes, the dome light comes with a new incandescent bulb installed. The lens is also included.

Can I use an LED bulb in this assembly?

Yes, you can replace the incandescent bulb with an LED equivalent. Ensure the LED is the same base type (usually 211-2 or 212-2) and that it is designed for automotive interior use. Some LEDs may require a load resistor to prevent flickering.

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