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Date: Wed, 04 Dec 2013 12:11:28 -0500
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Subject: Re: [LML] Re: Bendix S4LN-21 Mag shorted?
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From: Paul Miller <pjdmiller@gmail.com>
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The p-lead grounds the magneto when the key is OFF.  It is supposed to be gr=
ounded.

Paul

On 2013-12-04, at 10:59, Robert R Pastusek <rpastusek@htii.com> wrote:

> John,
> A number of possibilities, but first and easiest to check, is to be sure t=
he p lead is not grounded where it exits the mag. A washer or wire lug that t=
ouches the mag case when tightened will short it, as will leaving off the in=
ternal insulating washers and tube that keep the threaded post away from the=
 case.=20
>=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 disco=
nnecting them where they attach to the points.=20
>=20
> Hope this helps...
>=20
> BOB
>=20
> -----------------
> As part of bringing my Lycoming O-290-D2 into AD compliance, My A&E had th=
e 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 cor=
rectly when I  discovered that the Left mag was shorted to ground where the h=
ex nut P-lead connects to the mag.I eliminated all possibilities other than s=
omething internal to the mag.=20
> What could cause that? The A&E mentioned something about a metal finger do=
wn 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 l=
ogs 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 proje=
ct.
>=20
>=20
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>=20
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