The Standard Ignition DS 1678 SI Multi Function Column Switch is engineered to meet the rigorous demands of today s service professionals offering a robust designd high grade materials for enhanced durability and performance This switch is compatible with 1997 1998 Ford Expeditiond Lincoln Navigator models ensuring a precise fit and reliable operation Constructed with copper alloy conductors the DS 1678 SI ensures superior electrical conductivity with low resistive losses facilitating efficient operation of multiple vehicle functions The switch features a bolt ottachment method providing a secure and stable installation Its rectangular connector shape with two female connectors and 15 male blade terminals ensures compatibility with the vehicle s wiring system Designed to handle a 12 volt electrical system the DS 1678 SI is built to withstand the operational demands of modern vehicles The switch includes functions such as turn signal control windshield wiper control with multiple speed settings rear window wiper control and headlight dimmer control all integrated into a single easy to install unit Indicator markings are included for user convenience and the switch is designed for a 12 volt system aligning with the vehicle s electrical specifications The DS 1678 SI undergoes 100 testing to verify both mechanical and electrical switching performance ensuring reliability and longevity Its designd construction meet or exceed original equipment OE specifications providing a direct fit replacement that restores full functionality to the vehicle s control systems By choosing the Standard Ignition DS 1678 SI Multi Function Column Switch fleet operators can ensure that their vehicles maintain optimal performance reducing downtime and enhancing driver safety and comfort