Tagged: Johnson AT10
September 20, 2021 at 10:09 am #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.
SteveSeptember 20, 2021 at 11:17 am #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
US Member - 1 Year
Topics: 831September 20, 2021 at 1:02 pm #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.
Or this type of coil………?
Prepare to be boarded!September 20, 2021 at 5:25 pm #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.
Canada Member - 2 Years
Topics: 276September 20, 2021 at 6:12 pm #246962
AT-10 coils are different than the horseshoe coils used in the HD, TD, or TN motors.September 20, 2021 at 6:14 pm #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.September 20, 2021 at 7:41 pm #246970
I checked my box of magnetos and sorry to say I don’t have the parts you need.
The Boat House
Topics: 88September 20, 2021 at 10:39 pm #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.
You're only as smart as the person you're talking to.September 21, 2021 at 7:09 am #246988
Thank you very much for looking. I very much appreciate your replies and efforts.
SteveSeptember 21, 2021 at 7:16 am #246989
AT-10 coils are different than the horseshoe coils used in the HD, TD, or TN motors.
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.
Canada Member - 2 Years
Topics: 276September 21, 2021 at 11:03 am #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:
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