Description
Product Overview
The Standard Motor Products Door Jamb Switch (model DS278T) is engineered for precise ignition control in a variety of passenger cars. Constructed with brass contact material and a machined exterior, the switch offers superior conductivity and resistance to wear. It features a 2‑way circuit, normally open contact type, and screw terminal connections for secure wiring. Designed for door‑mount installation, the compact unit measures 1.5 x 1.2 x 2.9 inches and weighs only 0.32 ounces, making it an unobtrusive yet essential component.
Usage
This switch is ideal for automotive technicians and DIY enthusiasts restoring or upgrading door ignition systems on 1973‑2014 Ford, 1990‑1999 Jeep, 1988‑1991 Dodge, 1994 Mazda, and other compatible models. It functions reliably in both passenger and service vehicles, handling 240‑watt loads with an ON‑OFF operation mode. Install it on the door jamb to detect door closure and trigger the ignition sequence, enhancing vehicle security and convenience.

Why Choose Us
Standard Motor Products is a trusted name in automotive components, offering rigorous quality testing and OEM‑level specifications. Our Door Jamb Switch delivers consistent performance, easy screw‑terminal wiring, and a robust brass contact that resists corrosion. Backed by a comprehensive parts interchange list, it ensures compatibility across multiple brands, reducing inventory complexity for service centers.
Key Features
- Brass contacts provide high conductivity and long service life.
- Screw terminal design simplifies installation and ensures secure connections.
- Compact door‑mount form factor fits tight spaces without modification.
- 2‑way normally open circuit delivers reliable ignition signaling.
- Compatible with a wide range of Ford, Jeep, Dodge, Mazda, Chrysler, Lincoln, Mercury, Plymouth, and Eagle vehicles.
FAQ
What vehicles are compatible with this switch?
The DS278T fits 1973‑2014 Ford models, 1990‑1999 Jeep, 1988‑1991 Dodge, 1994 Mazda, 1990‑1991 Chrysler, 1990‑1998 Lincoln, 1975‑2001 Mercury, 1988‑1991 Plymouth, and 1991 Eagle vehicles.
How do I install the switch?
Mount the unit on the door jamb using the provided screw holes, connect the wiring to the screw terminals, and verify the ON‑OFF operation with a multimeter before reassembling the door.
Is the switch waterproof?
The product has an IP00 rating, meaning it is not protected against water ingress and should be installed in a dry interior location.
Can this switch be used for aftermarket upgrades?
Yes, its universal design and broad vehicle compatibility make it suitable for both OEM replacements and performance upgrades.
What is the warranty period?
Standard Motor Products offers a limited one‑year warranty covering defects in materials and workmanship.




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