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IMPORTANT: Electrical items are covered by a 30 day EXCHANGE ONLY WARRANTY. There are no returns or refunds on such items.Reproduction Of Original We often take our 1973, 1974, 1975, 1976, 1977 Chevelle or Malibu?s wiper switch for granted. They do a wonderful job of keeping us safe during inclement weather. Before Mary Anderson?s wonderful invention of the wiper system in 1903, the only way to drive during rain or snow was to literally open or prop the windshield and expose yourself and passengers to the harsh elements. We usually don?t pay as much attention to the health of our 1973, 1974, 1975, 1976, 1977 Chevelle wipers until they struggle or out right fail. Often, out right failure will be caused by faulty, worn or broken wiper switch. Usually replacement can be done with simple hand tools in an afternoon. Remember to always reference your Chevelle or Malibu?s service shop manual before starting any electrical project. What are Pulse Wipers? Pulse wiper systems were developed for instances such as very light rain or mist build up on the windshield. In these cases, the low wiper setting works too fast requiring the driver to manually turn the wipers on and off to clear the windshield. Leaving the wipers on low without sufficient water on the windshield can result in running the wiper blades across a semi dry windshield leading to annoying squeaks or blade vibration which can lead to excessive wear and tear on the wiper system components. Pulse wipers is a delay mode that supplies just enough power needed to run the wipers every few seconds; and in some model years, can be adjusted from as little as 2 seconds to up to 10 seconds. Each time the wipers need to wipe, they get power to perform a single sweep at the low speed.