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How to test a car relay with a multimeter

Model: (Various brands) Various
Part: Fuse box

Video tutorial

The relay, like the fuse, is an electrical component used in cars to control the power loads of certain components. In today's video, we will see how to test the operation of a 12-volt relay with a digital multimeter.

A 12-volt relay uses a coil made up of terminals 85 and 86 for activation. Set the multimeter to resistance measurement and connect it to the terminal points.

Apply a 12V voltage to the relay coil terminals; if the relay emits an audible click, it means it is functioning. If it does not activate, the coil is faulty.

In such cases, the relay needs to be replaced.


Posted on 27 June 2026 by ScegliAuto


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by ScegliAuto

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