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What is the function of Neutral Safety Switch on a 1998 Ford Windstar?

The Neutral Safety Switch (NSS) on a 1998 Ford Windstar, like in most vehicles, prevents the engine from starting unless the automatic transmission is in Park (P) or Neutral (N). Its function is primarily a safety feature to avoid accidental starting while the vehicle is in gear, which could lead to injury or damage. The switch is activated by the position of the transmission shift lever, and it completes an electrical circuit that allows the starter motor to engage. If the transmission isn't in Park or Neutral, the circuit remains open and the starter won't crank.