The principle of operation of the relay is based on the closing of contacts under the action of electromagnetic force, which occurs in the coil when electric current passes through it. Therefore, to test the relay, it is necessary to apply voltage to the control contacts "85" and "86" (contact numbers are printed on the relay body) and measure the resistance between power contacts "30" and "87".

If the relay is working properly, you will hear a click and the resistance will be close to zero (infinitely small). Otherwise, the relay is faulty and must be replaced.

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