[AT] Strange Magneto event today.

[Ken Knierim]

Interesting... is there any endplay or runout in the magneto shaft that may
throw the points off kilter when installed? It kinda sounds like a low
voltage side thing (kill switch, points, grounding) or something associated
with the installation (mechanical alignment, electrical connection or
incorrect rotation though the impulse probably wouldn't work).

I've never had the mag off a JD so I'm just shooting in the dark.

Ken in AZ

On Wed, May 20, 2020 at 11:04 PM Dean VP <deanvp at att.net> wrote:

> Was helping a friend today testing out some carburetors and Magneto's on
> his 1936 JD B. A very strange thing occurred. I was in charge of clean ing
> Magneto's up and getting them to the point that they would deliver spark
> manually on the bench. Then we would install them on a tractor and get the
> tractor running. I went though one Magenta pretty thoroughly and was
> getting really good spark out of both ports on the bench. Install it on the
> tractor absolutely no spark.   Could hear a really good impulse. We tried
> tightening it up tighter and also loosening it up. No change ...no spark.
> Blew me away I was getting really GOOD SPARK MANUALLY NOT MORE THAN A FEW
> MINUTES BEFORE. W hat in the sawmill would cause something like that.  The
> only thing we didn't check was to see if the Magneto was getting grounded
> properly to the governor.  That is the only thing I can think of right now.
> What other reasons would cause this strange event???  Really weird.
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