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Please Explain A Normally Open Relay VS. Normally Closed


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http://www.the12volt...aydiagram4.html I wired it like that and it didnt work! this is god damn irritating. My door locks are reverse polarity. When I do it like that and push the button on my alarm I can hear the relays switching, but the locks dont switch. Also as soon as the power and ground are hooked to the relays then the push locks stop working and as soon as they are un plugged they work again. What is going wrong?

For reversing polarity, you have to isolate the wires when pulsed. There are modules for that. Or you can use a couple relays

Ed Lester

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