Today's Message Index:
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1. 03:49 PM - P-leads and grounding of shields (Gil Alexander)
2. 09:08 PM - Re: P-leads and grounding of shields (TeamGrumman@aol.com)
3. 09:34 PM - Re: P-leads and grounding of shields (Gil Alexander)
Message 1
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| Subject: | P-leads and grounding of shields |
--> TeamGrumman-List message posted by: Gil Alexander <gilalex@earthlink.net>
posted on the other list too....
I'm installing a new Horizon electronic tach. and replacing my p--leads at
the same time, since the switch is out, and the cowling off for the
Mitchell instrument installation - the old "while we are it" - and the
magneto end does look ratty...
However, I can't find the correct wiring for the shields of the p-leads at
the ignition switch.
My p-leads have been changed in the past (actually had a log book
entry...:
) so I no longer know what the correct original configuration
should be...
Do the p-lead shields connect to the ground terminal at the ignition switch?
This would seem to be a good way of connecting, and no extra ground would
be needed at the switch.
However, Gary's schematic shows a separate ground wire at the switch (going
to the airframe - called 51JA3), and NO shield connections at the
switch.... this would also seem correct.
But, if I attach the P-leads shield to the ignition switch ground, and also
take it to the airframe, I have made a large ground loop in a noisy circuit
- I think. This does not seem correct, but that is how the present switch
is wired.
Does anyone know the correct wiring of shields at the ignition switch?
...thanks gil in Tucson
77 Tiger
Message 2
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| Subject: | Re: P-leads and grounding of shields |
--> TeamGrumman-List message posted by: TeamGrumman@aol.com
the shield on the P-lead doesn't ground at the magneto switch.
Message 3
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| Subject: | Re: P-leads and grounding of shields |
--> TeamGrumman-List message posted by: Gil Alexander <gilalex@earthlink.net>
Thanks Gary... that makes sense from a "no ground loop" point of view.
And it makes the wiring easier.... less shields to dress on the wire.
I presume 18 gauge shielded wire from Aircraft Spruce is OK.... MIL-C-27500
....thanks gil in Tucson
At 10:07 PM 2/26/2006, you wrote:
>--> TeamGrumman-List message posted by: TeamGrumman@aol.com
>
>the shield on the P-lead doesn't ground at the magneto switch.
>
>
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