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From: Robert R Pastusek <rpastusek@htii.com>
To: Lancair Mailing List <lml@lancaironline.net>
Subject: RE: [LML] Bendix S4LN-21 Mag shorted?
Thread-Topic: [LML] Bendix S4LN-21 Mag shorted?
Thread-Index: AQHO8QFkQRAURK+1rUOu/sJ1LlpU0JpEL2JQ
Date: Wed, 4 Dec 2013 15:59:22 +0000
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John,
A number of possibilities, but first and easiest to check, is to be sure th=
e p lead is not grounded where it exits the mag. A washer or wire lug that =
touches the mag case when tightened will short it, as will leaving off the =
internal insulating washers and tube that keep the threaded post away from =
the case.=20

Also, the mag coil has very little resistance. It will show as "grounded" i=
f the points are closed. You can separate the electrical components by disc=
onnecting them where they attach to the points.=20

Hope this helps...

BOB

-----------------
As part of bringing my Lycoming O-290-D2 into AD compliance, My A&E had the=
 mags rebuilt at a shop in Ohio. When they returned, he reinstalled them on=
 the engine and timed them. Today, after I hooked up the new Bogert P-leads=
, I was ohming them out to insure that I had the ignition switch wired up c=
orrectly when I  discovered that the Left mag was shorted to ground where t=
he hex nut P-lead connects to the mag.I eliminated all possibilities other =
than something internal to the mag.=20
What could cause that? The A&E mentioned something about a metal finger dow=
n in the bottom of the hole. Anyone know what that does? Could a shorted ca=
pacitor- the one that was supposedly just replaced - cause this problem? My=
 logs are at the hangar but I think this is a S4LN-21 mag. Any advice would=
 be appreciated, 'cause I'm getting real tired of going backwards on this p=
roject.


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