[How Does] An Automotive Relay Work

How does a relay magically power on or off a circuit? It isn't magic, but a very simple process!
Understanding how a relay works is important to better understand how to diagnose and modified or add circuits to a vehicle system.
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[@fegmihamedlafi5051]

Great explanation easy to understand

[@MasterAutomotiveTraining]

Glad you think so! Thanks for watching.

[@hammerhead6537]

Clear concise explanation. Thank you.

[@MasterAutomotiveTraining]

Thank you buddy!

[@garysmith5666]

Great diagraming and explanation.

[@MasterAutomotiveTraining]

Thank you for that kind comment. 👍🏻

[@amitabhasaha9784]

Do all automotive relays have inbuilt diode or resistor to prevent back EMF?

[@MasterAutomotiveTraining]

Yes, when any coil turns off the left over energy needs to head back to ground and the diode/resistor help cap the kick back and not hurt or shut off pcm control.