home made coil and condensor testers

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  • outboardnut

    US Member - 1 Year (includes $3 online payment fee)
    Replies: 931
    Topics: 419
    #274042

    I did not want to steal the Mercotronic thread.Thought this info may be useful to someone.
    Fellow members built these for me a long time ago. I never had any problems

    coil-test-1-of-2

    Coil-tester-part-2-of-2

    2 users thanked author for this post.

    outboardnut

    US Member - 1 Year (includes $3 online payment fee)
    Replies: 931
    Topics: 419
    #274045

    condenser-tester-1-of-2

    condenser-tester-2-of-2

    1 user thanked author for this post.

    29Chev


    Replies: 21
    Topics: 2
    #274203

    Thank you for sharing this information.  I cleaned up the text and the drawing of the magneto tester and converted it into a pdf.  I think I have the wiring highlighted correctly but please advise if I don’t.

    Image-Cleaned-Up-20


    joecb

    US Member - 2 Years
    Replies: 912
    Topics: 92
    #274234

    I have one of these condenser testers. I think that mine was commercially made, but the circuit is as shown in ‘outboardnut’s” post. It is reliable, gives a good indication of condition. The neon light tells the story…. No blink – bad condenser.  The rate of blink is directly proportional to the capacitance… not scientific, but by comparing the blink rate to a known value cap, you can pretty much match an unknown. The voltage stress level is only about 67 volts, so a cap that tests good might in fact fail under actual use in a magneto, but so far the tester has proven reliable.

    Joe B


    outboardnut

    US Member - 1 Year (includes $3 online payment fee)
    Replies: 931
    Topics: 419
    #274246

    Looks good to me- But like I said -it was built for me


    crosbyman

    Canada Member - 2 Years
    Replies: 3619
    Topics: 331
    #274247

    Microsoft Word – Part2_Condenser_Testers_And_Testing_Correctly.doc (wrcoutboards.org)

    Joining AOMCI has priviledges 🙂


    Mumbles


    Replies: 5764
    Topics: 298
    #274256

    If I’m not mistaken, this tester only tells you if the cap is good or bad, working or not. What it doesn’t tell you is the uF rating of the cap, which is very important to.

    I’ve found that the uF readings of caps used in our magnetos tends to rise with age while the uF readings of electrolytic caps used in audio gear tend to fall over time. Regardless, they all have a certain lifespan and will start leaking and wandering from their original uF rating requiring replacement. Even unused old ones sitting on a shelf go bad over time.

    Here’s a pile of leaky points arcers destined for the trash with about twice as much capacitance as they should have.

    2013-06-21-11.21.11


    crosbyman

    Canada Member - 2 Years
    Replies: 3619
    Topics: 331
    #274266

    Mumbles if your comment refers to M.Mohat’s test box…. YES it only checks leakge   good or bad…. I test all caps with a capacitance  meter

    Joining AOMCI has priviledges 🙂

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