telfair Door Jamb Light Switches for 1968–1984 GM Cars – 2-Pack, 3/8"–24 Thread, Direct Replacement

These two telfair door-jamb switches replace GM part numbers 4891633 and 14014578 to restore interior dome-light grounding on 1968–1984 GM cars and trucks.

This pair of door jamb light switches is engineered to match the original fit and function used on many classic GM vehicles, including Camaro, Chevelle, Firebird, Nova and Impala, as well as GM trucks from 1968 through 1984. Each switch threads into the door jamb with a 3/8"–24 thread size and completes the ground circuit that triggers the interior dome light when doors open. Backed by a one-year unlimited-mileage quality guarantee, these switches are a direct, low-cost restoration part for older GM models that rely on GM #4891633 (Group 11.950).

Will these switches fit my 1969 Camaro or 1975 Impala?

Yes—these units are designed to replace the factory switches used on many GM models produced from the late 1960s through the early 1980s. Confirm compatibility by checking your existing part number or the thread size before ordering.

• Direct replacements for GM 4891633 and 14014578.
• Thread size: 3/8"–24 for proper jamb fitment.
• Intended for GM vehicles from 1968–1984 and other early GM models using Group 11.950.

How does the switch restore my dome light operation?

The switch closes the ground connection when the door opens, allowing the dome light circuit to energize. If a jamb switch is worn or corroded, the light may stay off or flicker; replacing it re-establishes a reliable ground path and consistent dome-light behavior.

• Completes the ground circuit for the interior dome light.
• Replaces worn or non‑conductive original jamb switches.
• Restores dependable on/off operation tied to door position.

How difficult is installation and what tools are needed?

Installation is straightforward and typically requires only basic hand tools. Remove the old switch with a socket or wrench that fits the 3/8"–24 body, thread the new switch in place, and reconnect any wiring or terminal as originally configured.

• Tools: adjustable wrench or suitable socket, pliers for terminal connections.
• Typical labor: quick, often under 15–30 minutes per switch.
• No special calibration—install and test by opening the door.

What warranty and quality assurances come with these switches?

telfair supports these switches with a one-year unlimited-mileage quality guarantee, covering manufacturing defects under normal use. This provides assurance when replacing aging electrical hardware on classic vehicles.

• 1-year unlimited-mileage quality guarantee from telfair.
• Manufactured to match GM original specifications for fit and thread size.
• Sold as a pair to service both sides of a vehicle or provide a spare.

Who is this for: These telfair door-jamb switches are meant for classic GM owners, restorers, and mechanics who need an accurate, affordable replacement for aging or failed jamb switches. If you own a late-1960s to early-1980s Chevy, Pontiac, Oldsmobile, Buick or GMC truck that uses GM #4891633 (Group 11.950), this two-piece set restores reliable dome-light grounding and preserves original electrical function without modification.