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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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How to wire a relay for 12v car lighting

The relay is currently switched on via an accessory power wire with inline switch. I would prefer the relay to turn the lights off when the headlights are switched on. … How can I wire the relay to switch off the daytime lights when power is applied to the headlight wire? Thanks …
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