I have wired a Rain Tracker in my car.
When you put the normal wiper switch on slow, if the switch I put under the left side relay cover is on, the wipers are controlled by the sensor which is stuck to the windscreen. There are some videos out there on how it goes from variable intermittent, slow and high. It works quite well.
I also wired in my side lights so they are turned on by the sensor also, another switch is under the panel so that can be returned to normal also.
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