Rebel Editor July 12, 2018 31 Comments



Testing a car relay involves the use of a 12-volt source, such as a car battery, and a multimeter that is capable of reading resistance. Find out how to listen for …

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  3. HITMANTanke66

    A 9v battery will also do the job to test relays

  4. Kenny Sellers

    So is the relay functioning or is it shot?

  5. goemon9378

    thanks a lot for this info!
    i was wondering how to tell what number each terminal is on my relays till i noticed them written very small on the underside heh

  6. Avery Conyers

    This guys stupid never your a resistance test on anything while it it hooked up you to a voltage test. That's even what he did in the video but wasn't smart enough to know it

  7. Trevor Friesen

    apparently your not sure how a relay works. relays work by powering one circuit to control another circuit, he is testing the switch that is controlled by the smaller amperage circuit. so there is no power there. you need to check resistence of the switch to make sure there is no open.

  8. Brenndon McGill

    I work on F-16's and we have a relay tester I'm thinking about making one. Just take a relay block from a car and have inputs from battery and outputs to a green light so when you push a button the light lights up if it works. idk. Seems easier in the long run.

  9. n00g7

    You just need some AA or AAA's too, not a car battery. For 5 pole you'll want a switch that breaks power to the coil and alternately couples the test lead between 87 and 87a. Obviously those two circuits need to be isolated but by activating with a single switch you just have to e.g., with a push button, plug in relay, listen for tone, then push button, listen for tone, rinse and repeat.

  10. n00g7

    I suggest you delete this comment if you don't want people calling you stupid every couple weeks.

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