I can't tell if there is a lower cost option for the opto, since we are just looking at a single tree in a forest here, but the opto should do it, same circuit as the original with an opto enable.
yah, the GND should be connected to batt neg? Don't want it to go to vehicle GND on accident.
The R7 looks strange though, like it is always "sorta" on.
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WINDMILLS DO NOT WORK THAT WAY!!!
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