First Things First
I am not a bonified electrisherman.
My caveman thinking would be to make a coil that generates enough power to trip a bosh relay. Do know that most bosh relays require very little volts/amps to work. How little I don't know. Also don't know how many feet of magnet wire it would take, wrapped around the wiper hot wire, to create enough seperate current to trip a relay. Do know that you can put loops in a hot wire to increase ouput of the wrap wire. The seperate current generated would have it's own +/- (independant of car power) and only work when wipers were running.
Just thinking out loud and please ignore if nonsense
Clay
ps
Just found a few gadgets/trinkets to experiment and see if this is even plausible
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