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Main relay click test results

Motor Vehicle Maintenance & Repair Asked on April 9, 2021

Civic vti coupe 1999.

I heard that you can test a main relay by checking for clock with each key turn. So every time you turn the key you will get hear one click. Here’s what I found:

  1. Lock to accessory: no clicks at all
  2. Accessory to run: immediate click, can hear fuel pump prime, another click at end so 2 clicks in total
  3. Run to start: clock immediately, car tries to start and cuts out immediately, clicks again.

So definately didn’t get a click on the first turn plus other stuff going on.

Does this mean relay might be faulty or is this all normal/the three click test isn’t for all cars?

Thanks

One Answer

I would say no, You cant test a relay by listening for any clicks. Usually when a relay breaks its from a crack that happens at the bend of the switching contacts arm. In many cases the contacts will still go back and forth from 87 / 87a and make the clicking sound but its no longer connected to the load supply 30.

To test most basic auto relays, remove it:

  • Give 12VDC to coil (86) and load (30)
  • Use a test light clipped to GND and probed on (87)
  • Give GND to coil (85)

You should hear a click and see the light. You can also probe 87A when you do not have GND on (85) and it should be lit.

Video trying to explain what I meant in first paragraph https://youtu.be/6KcKs4wzM9M

Answered by narkeleptk on April 9, 2021

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