The STANDARD IGNITION DS 957 SI Door Jamb Switch is engineered to meet the rigorous demands of commercial fleet operations ensuring reliable door position detection for various Ford models including the Excursion Expedition F 250 Super Duty F 350 Super Duty F 450 Super Duty F 550 Super Duty F 650 F 750 Thunderbird Windstar Aviator and Navigator This switch plays a critical role ictivating interior lighting and monitoring door status thereby enhancing operational efficiency and safety Constructed with high grade materials the DS 957 SI features a robust design that withstands the harsh conditions typical in heavy duty vehicle environments Its copper alloy conductors ensure superior electrical conductivity with minimal resistive losses contributing to consistent performance and longevity The switch is designed for direct mounting on door jambs facilitating straightforward installationd secure operation Its female connector and blade type male terminals provide a reliable connection minimizing the risk of electrical failures The plunger size of 0 15 inches 3 81 mm is optimized for precise activation ensuring accurate door status detection The DS 957 SI is compatible with a wide range of Ford vehicles including the 2002 2003 Ford Excursion 2002 2003 Ford Expedition 2002 2003 Ford F 250 Super Duty 2002 2003 Ford F 350 Super Duty 2002 2003 Ford F 450 Super Duty 2002 2003 Ford F 550 Super Duty 2002 2003 Ford F 650 2002 2003 Ford F 750 2003 Ford Thunderbird 1999 2003 Ford Windstar 2003 Lincolviator and 2003 Lincoln Navigator By integrating the DS 957 SI into your fleet you can expect enhanced operational efficiency reduced maintenance costs and improved safety standards The switch s durable constructiond reliable performance help minimize downtime and ensure that interior lighting and door status monitoring systems function optimally thereby supporting the seamless operation of your fleet