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Relays( Electrical Relay, Relay) protect electrical systems by preventing and reducing damage to the connected equipment from overcurrents and voltages. it  can be used in Automotive, Appliances, Lighting systems, Telecommunication components, Industrial controllers, Electrical power protection systems, and Traffic control. Normally, a multimeter can test whether a relay is good or bad. 

Locate the relay: Find where the circuits enter and exit the relay. 

Check for voltage: With the multimeter set to measure voltage, probe the point where the relay plugs into the circuit.

Test ground connection: If voltage is present at the connection point, switch the multimeter to the continuity or resistance function and check for a good ground connection on the opposite side of the relay. 

Verify power source: After successfully checking for voltage and testing the ground connection, check the voltage where the relay connects to the battery or another power source. 

Test component connection: Use the multimeter’s continuity function to ensure a strong connection between the relay and the component it controls. 

How to test a faulty relay?

Remove the relay from the fuse box or vehicle.

Determine where the input and output points of the circuit are located on the relay.

Make sure your multimeter is set to ohm.

Connect the leads of the multimeter across the entrance and exit pins to determine resistance. Ideally, you’ll see a reading between 50 to 120 ohm.

If your multimeter has a reading of Open or Out of Range you may have a defective coil winding and the relay will need to be replaced.

If the reading looks good, you’ll want to connect the leads in between the switch pins. You should see a reading of OL or Open.

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