Intermittent wipers using the OEM pull type wiper interval wiper switch from @FJ40GURU, A Datsun wiper amp module and sub harness I put together. Plugs directly into old wiper switch plug, just add a switched 12vdc power source. The wiper switch has OFF, INT, SLOW and FAST positions as you pull it out. To select wiper interval I used a toyota pickup fan switch and 3 resistors that gives me three intrval speeds. A potentiometer could also be used for infinite adjustment or a single resistor to ground for a single speed that satisfies you. No mods required to switch or Datsun wiper module or your wiper motor. Plug and play. This was made for my 73.
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