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A relay is an electrically controlled switch. Electromechanical relays use an electromagnet to activate mechanical contacts, solid-state relays use semiconductor switches.

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Replacing relay for solid state alternative to detect if a connector is plugged in

My idea is for the connector to the new light to have tree wires that, when connected will trigger a relay to disconnect the original OEM light, while, at the same time powering the new light. … My circuit idea is as follows: I would like to not depend on a relay and go full solid state, but I do not know how to implement this solution or a similar one that would render the same result. …
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