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    cheetaht2's Avatar
    cheetaht2 Posts: 2, Reputation: 1
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    #1

    May 3, 2009, 04:10 PM
    Can a main relay switch be tested to see if it is bad?
    I am trying to determine if my main relay switch is bad in my 1990 Honda Accord LX. Is there a test for it before I purchase one?
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
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    #2

    May 3, 2009, 05:09 PM

    If your starting problem is not temperature-related, the main relay is not likely the culprit. Having said that, there are bench tests that can be run on main relays, however I place little faith in them. It's better to replace them every 120,000 miles or 10 years, whichever comes first.

    In most cases, what appears to be a main relay problem (effect) is really caused by ECM failure. Perform the K-Test on the ECM, before condeming the main relay.
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