Standard Ignition DS-850 Door Jamb Switch - Front, Front Left, Front Right or Rear

Door Jamb Switch for Ford and Mercury Applications

The Standard Ignition DS-850 door jamb switch is built for vehicles that rely on a dependable door-open signal for warning lamps and related electrical functions. It uses copper alloy conductors for strong electrical conductivity and low resistance, with a bolt-mount design for secure installation at the door opening.

Fits 2001-2005 Ford Explorer Sport Trac, rear warning light; Fits 2001-2005 Ford Explorer Sport Trac, front left warning light; Fits 2001-2005 Ford Explorer Sport Trac, front right warning light; Fits 1995-2003 Ford Explorer, front left warning light; Fits 1995-2001 Ford Explorer, front right warning light; Fits 1995-2001 Ford Explorer, rear warning light; Fits 1997-2001 Mercury Mountaineer, door open warning lamp, front and rear.

• Standard Ignition DS-850 door jamb switch for door-open warning circuits
• Female connector with 1 male blade terminal
• Bolt-mount design for door mounting locations
• Built with copper alloy conductors for efficient electrical transfer
• 100% tested for mechanical switching and electrical performance
• Cross-references Standard Ignition DS-850 applications with 1S1338

Detailed Product Overview

The DS-850 is a door jamb switch used to trigger interior warning lamps and door-ajar signals when a door opens or closes. It is a direct-fit electrical service part for Ford Explorer, Ford Explorer Sport Trac, and Mercury Mountaineer applications, along with additional Ford and Mercury models listed in the fitment data. Standard Ignition builds this switch with durable materials and verified switching performance to meet the demands of routine repair work.

This part number, DS-850, is commonly searched for Ford Explorer door jamb switch replacement, Ford Explorer Sport Trac door open warning light switch, and Mercury Mountaineer door ajar switch service.

Common Problems This Part Can Address

• Door-ajar or door-open warning lamp staying on
• Interior courtesy light not responding to door movement
• Intermittent warning light operation at the door opening
• Electrical switching issues caused by worn switch contacts
• Faulty door signal input on supported Ford and Mercury vehicles

Installation Notes and Tips

Verify the connector style, terminal layout, and mounting location before installation. This DS-850 uses a female connector, one male blade terminal, and a bolt-mount design, so the replacement should match the original switch configuration at the door. Confirm the vehicle position and warning-light application against the fitment list for your specific Ford Explorer, Ford Explorer Sport Trac, or Mercury Mountaineer.

Quality Assurance

Standard Ignition states that this switch is 100% tested for both mechanical and electrical switching performance. The design uses copper alloy conductors and robust materials to support consistent operation in service applications.