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  1. #31
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    Default Re: Air compressor troublee shoot question

    Quote Originally Posted by Gary Fowler View Post
    I don't think you want to spend that kind of money to test a capacitor. Take it to a shop for a test if bad and you buy a new capacitor there shouldn't be a charge for testing.
    One doesn't have to spend much money to test a capacitor. In fact, one may not have to spend any money at all if they have an ohm meter. While a capacitor tester will give you the actual capacitance, a simple ohm meter is often adequate for a simple go / no go test. As a former electronics technician, I did it this way for years. Unless a capacitor was marginal, where I would then use a capacitor tester to get a more accurate reading.

    test capacitor with ohm meter - Google Search
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  2. #32
    New Member PalmSprings's Avatar
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    Default Re: Air compressor troublee shoot question

    Quote Originally Posted by kenmac View Post
    Mine cost more $ than that. I just posted the cheapest I could find for him.Unless he is going to use 1 alot.I wouldn't buy it.That's why I also advised a motor shop to have his tested.He could probably buy several caps. for the cost of the tester
    Thanks! You got my implication in my prior post correct.
    i guess i should have been a little clearer on that post.

  3. #33
    Platinum Member Steave's Avatar
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    Default Re: Air compressor troublee shoot question

    If you're testing it yourself using the link posted by MasseyWV and find your cap bad here's a link to a new one.

    DAYTON StartCapacitor, 124-149 MFD, 330 VAC, Round - Capacitors - 2MEL9|2MEL9 - Grainger Industrial Supply

    As stated before the voltage reading of 330 VAC on this cap is the max rating of the cap not the voltage the motor runs on.

    Also before testing make sure you touch the two leads on the cap together to discharge any voltage that may be built up in the cap. If voltage is present poof there goes your meter or at least the fuse protecting the meter.

    If you buy another cap and the leads are a different configuration just splice the wires as needed. It don't matter which of the two wires goes to which on the cap there's no ,+ or - , or any polarity on this type cap. Either wire you remove from the old cap will just tap back onto either terminal of the new.

    If by any chance there's 3 leads on the old cap you have a dual cap. That means it's two caps in one. One for start and one for run. If it has two leads you can do as I mentioned above. If it has 3 leads it will matter where the leads hook up and the cap I refered to won't work.
    I've got a cutting torch and a welder sooo YEAH it'll fit!!

  4. #34
    Super Member kenmac's Avatar
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    Default Re: Air compressor troublee shoot question

    Quote Originally Posted by MasseyWV View Post
    One doesn't have to spend much money to test a capacitor. In fact, one may not have to spend any money at all if they have an ohm meter. While a capacitor tester will give you the actual capacitance, a simple ohm meter is often adequate for a simple go / no go test. As a former electronics technician, I did it this way for years. Unless a capacitor was marginal, where I would then use a capacitor tester to get a more accurate reading.

    test capacitor with ohm meter - Google Search
    B-4 meters came out.I use to test caps. with my tongue like testing 9v batteries
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  5. #35
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    Default Re: Air compressor troublee shoot question

    Quote Originally Posted by kenmac View Post
    B-4 meters came out.I use to test caps. with my tongue like testing 9v batteries
    Try that on a high voltage, high capacitance capacitor like those used on electric motors and let us know how it works out.
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  6. #36
    Super Member kenmac's Avatar
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    Default Re: Air compressor troublee shoot question

    Quote Originally Posted by MasseyWV View Post
    Try that on a high voltage, high capacitance capacitor like those used on electric motors and let us know how it works out.
    Guess that's why I have no taste buds.Testing too many HVAC caps. like this

    Disclaimer:
    Seriously, no one should actually try this at home.
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  7. #37
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    Default Re: Air compressor troublee shoot question

    Quote Originally Posted by kenmac View Post
    Guess that's why I have no taste buds.Testing too many HVAC caps. like this

    Disclaimer:
    Seriously, no one should actually try this at home.
    I just hope nobody takes us seriously and decides to try it. Oh well, it will suck to be them if they do.
    .

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