1937–1954 GM Universal 6-Volt Headlight Relay #1116789

Available for sale is a genuine General Motors New Old Stock (NOS) 6-Volt Headlight Relay, GM part number 1116789, designed for 1937–1954 GM applications (universal use across various Chevrolet passenger cars and trucks, depending on wiring configuration). This original GM service replacement component is a rare and highly desirable electrical part for restorers working on early pre- and post-war 6-volt General Motors vehicles.

This era of GM vehicles—including pre-war, immediate post-war, and early 1950s models—used 6-volt electrical systems that required reliable relays to properly manage headlight circuit load and improve lighting performance. Vehicles from this period are widely restored today due to their historical significance and classic American styling.

The headlight relay plays an important role in the vehicle’s electrical lighting system. It helps control and distribute electrical current to the headlights, reducing strain on the headlight switch and improving overall lighting reliability and efficiency. By using a relay, voltage delivery becomes more consistent, resulting in improved headlight performance and reduced switch wear.

Over time, original relays can fail due to internal contact corrosion, heat fatigue, moisture intrusion, or general age-related deterioration. A failing relay may cause dim headlights, intermittent operation, or complete lighting failure—making replacement essential for safe nighttime driving and correct restoration function.

This component is a true New Old Stock (NOS) GM service replacement part, meaning it was manufactured during the original production era and has never been installed on a vehicle. It retains original factory specifications, construction quality, and electrical design intended for proper 6-volt system operation.

Unlike many modern aftermarket replacements, NOS GM relays offer authentic construction, correct terminal layout, and original operating characteristics. This is especially important for restorers aiming to maintain factory-correct electrical systems in early GM vehicles.

For restorers, maintaining proper lighting system function is essential for both safety and authenticity. Whether restoring a pre-war Chevrolet, a 1940s Fleetline, or an early 1950s pickup, this relay helps ensure dependable headlight performance while preserving original electrical design.

As original 6-volt GM electrical components become increasingly difficult to locate, NOS relays like this have become highly sought after by collectors, restoration specialists, and vintage vehicle enthusiasts.

Product Features

Genuine General Motors New Old Stock (NOS) part
GM Part Number: 1116789
6-Volt Headlight Relay
Universal GM application (1937–1954 vehicles)
Supports proper headlight circuit operation
Reduces electrical load on headlight switch
Factory-correct electrical system component
Original GM service replacement part
Never installed on a vehicle
Ideal for restoration and electrical system repair
Rare early GM lighting system component

Vehicle Compatibility

Fits select GM applications including:

1937–1942 Chevrolet passenger cars and trucks
1946–1954 Chevrolet passenger cars and trucks
Various early GM 6-volt electrical system vehicles

Compatibility may vary depending on wiring configuration and electrical system setup. Buyers should verify fitment before purchase.

Condition

This component is offered in New Old Stock (NOS) condition. It has never been installed and remains an original GM service replacement part. Due to decades of storage, minor shelf wear, oxidation, or packaging aging may be present.

For collectors and restoration enthusiasts seeking authentic early GM electrical components, this 1937–1954 GM Universal 6-Volt Headlight Relay #1116789 represents an excellent opportunity to restore factory-correct lighting performance, improve reliability, and preserve originality in your vintage General Motors restoration project.