The Mercury Grand Marquis Turn Signal Switch enables drivers to clearly signal their directional changes, along with the operation of several lights, from one lever on the steering column. In early Grand Marquis models, the Turn Signal Switch was simply focused on left and right blinkers. Later on, the Mercury builders added controls for headlights, fog lamps, wipers, and cruise to the Turn Signal Switch, forming a convenient multi-purpose stalk. When the switch gear is fitted in 1990s Mercury or 2000s Grand Marquis, it works in the same manner. When the lever is clicked up or down, internal contacts close circuits that send current to the appropriate lamps. This allows surrounding traffic to know of the planned maneuver. The cancellation cam is spring-loaded, which returns the Turn Signal Switch to neutral once the wheel becomes straight. Essential components remain interchangeable for nearly all production years of Mercury vehicles. The only exception to this rule is the shape of the wiring plug, which differs between early two-connector units and the later single-plug Turn Signal Switch style. Keeping the Turn Signal Switch responsive preserves the Grand Marquis' reputation for straightforward, safe road manners.
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