How to test relays using multimeters.
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Multimeter [ Ссылка ] *
Battery [ Ссылка ] *

To test if a relay is functioning properly, you only need a 9V battery for the most basic test.

Just place the battery on the relay terminals that are connected to the relay coil.
When you place the 9V battery on the relay coil terminals, the relay will click.
Try the switching the + and - positive and negative terminals if the coil doesn't work.

When the relay clicks it is turning on or off depending how it's configured.

Relays have NC and NO terminals.
NC is normally closed.
NO is normally open.

NC is letting electricity pass thru the relay when there is no voltage and electric current flow across the relay coil terminals.
When the coil is energized, the NO terminals, close and let electricity flow.

Showing in the video the power supply of an old JVC VCR.
Matshushita JD2a-DC12V
AJD491

And a Chinese Arduino relay module.
Songle brand. SRD-05VDC-SL-C
10A 250VAC

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