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One issue is that when the relay loses power it switches to the flap open. Can I change something to switch to closed on power off?
Not that I know of. My understanding is that when it looses power it opens the switch thereby closing the valves. I have been running this setup for over a year with a few two week periods of not driving the car with no issues of the battery being drained so I wouldn't worry too much about that.
Mark
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