This is what it says in the tech wiki.


Mid-model utes and later Sunny Truck came with intermittent wipers. Intermittent wipers were an option for the 1200 starting in 1978 April. Then became standard fitment starting October 1981. They are just like the regular switch with two positions Slow and High, but with another position which is intermittent every six seconds. So instead of OFF plus two stops, it has OFF plus three stops. It uses the same wiper motor as all 1200s, so the wiring harness does not need to be modified. The only downside is they are not variable intermittent.


http://datsun1200.com/modules/mediawi ... title=Intermittent_Wipers