1940 Johnson AT10, 5 hp Coil and Condenser – where to find?

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  • Steven Moore

    US Member - 1 Year
    Replies: 8
    Topics: 2
    #246939

    I’m looking to replace the coil and condenser and points on a 1940 Johnson AT10, 5hp. Unfortunately, I don’t have a parts manual, so I can’t list the parts numbers or search for them.

    Ideally, does anyone have a part number for a newer replacement coil, points, and condenser? On-line parts books don’t seem to go back that far. Or, better yet, does anyone have a good, tested coil to sell and/or points/condenser? It’s the coil that uses grounding brushes and has the plug wires coming out each side.

    I also believe it might be the same for the LT37, DT39, AT39, LT10, and DT10, but have not confirmed.

    Thank you!

    Steve


    lloyd

    US Member - 2 Years
    Replies: 316
    Topics: 3
    #246942

    I have some good tested used ones (coils , points, condensers) from a TD. I think they are the same as the earlier ones? Lloyd 231-929-7479


    Buccaneer

    US Member - 1 Year
    Replies: 5085
    Topics: 831
    #246943

    Is it this style coil?
    There’s a thread on the forum about someone replacing the carbon brushes
    that made their motor run good.

    Mag-plate-file-photo

    Or this type of coil………?

    DSCN6265

    Prepare to be boarded!

    • This reply was modified 1 month ago by Buccaneer.
    • This reply was modified 1 month ago by Buccaneer.
    • This reply was modified 1 month ago by Buccaneer.
    Attachments:

    Steven Moore

    US Member - 1 Year
    Replies: 8
    Topics: 2
    #246955

    It is the first of your pictures picture type. I will post a picture I just took below. Thank you so very much for the fast reply!

    1940 Johnson AT10 Magneto

    • This reply was modified 1 month ago by Mumbles.
    Attachments:

    Steven Moore

    US Member - 1 Year
    Replies: 8
    Topics: 2
    #246957

    Thank you for your very fast reply. I’m not certain the AT10 coil (single coil) is the same as the TD coils. Please see the picture I posted. If you do have a tested one of these At10 type coils and/or condenser, I would be happy to buy it from you.

    IMG_4581a-1

    Attachments:

    Mumbles

    Canada Member - 2 Years
    Replies: 5171
    Topics: 276
    #246962

    AT-10 coils are different than the horseshoe coils used in the HD, TD, or TN motors.

    Coils-Less-Heels

    HD-TN-Coils


    lloyd

    US Member - 2 Years
    Replies: 316
    Topics: 3
    #246966

    Thanks for the photos. The later TD coils I have are different. But I may have the coils and or condensers you need in my box full of magnetos. I will have to go up to my shop and see what I have.


    lloyd

    US Member - 2 Years
    Replies: 316
    Topics: 3
    #246970

    I checked my box of magnetos and sorry to say I don’t have the parts you need.


    The Boat House


    Replies: 3564
    Topics: 88
    #246976



    They use the same coil in the single’s (LS & DS 38-39)
    and ground out 1 lead. If you have the hardware you can
    use one of them.
    Tubs

    You're only as smart as the person you're talking to.


    Steven Moore

    US Member - 1 Year
    Replies: 8
    Topics: 2
    #246988

    Lloyd:

    Thank you very much for looking. I very much appreciate your replies and efforts.

    Steve


    Steven Moore

    US Member - 1 Year
    Replies: 8
    Topics: 2
    #246989

    AT-10 coils are different than the horseshoe coils used in the HD, TD, or TN motors.

    Coils-Less-Heels

    HD-TN-Coils

    Mumbles: Excellent! Thank you very much for the part number. That’s a huge start for me.

    I’m still hunting for the condenser part number and/or the microfarrad value, so I may test what I have.


    Mumbles

    Canada Member - 2 Years
    Replies: 5171
    Topics: 276
    #246993

    The original P/N for your motors condenser is 72-1036 and it had a rating of .21 uF. Thanks goes out to Garry in Michigan who had compiled this list a few years ago.

    Since the original condensers are NLA, certain Orange Drop or Vishay capacitors can be substituted for the originals. The axial Vishays can be mounted in the original can, or out in the open.

    Here’s a link to Digi-Key who supplies the High Quality series of Vishay caps in different ratings:

    https://www.digikey.com/en/products/detail/vishay-beyschlag-draloric-bc-components/MKP1839422084HQ/2260507?s=N4IgTCBcDaIEYGMwDYAMBOAtAOwCYgF0BfIA&vendor=0

    Caps-Johnson

    0.22-uF-Caps

    DSC00074


    outboardnut

    US Member - 2 Years
    Replies: 802
    Topics: 349
    #247016

    Please correct me if I am wrong-
    but John Collins from Indiana wrote the article on values of condensers.

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