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john.marzulli(at)gmail.co
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 Posted: Fri May 01, 2009 3:41 pm Post subject: Need some help with the ignition switch |
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I am using the ignition switch supplied by Zenith, sources from ACS.
Playing with it I wanted to do a quick hookup to a small 12V lantern battery and confirm how it is supposed to work using a multimeter. Using the diagram I hooked up some wires using test clips.
What I found was that the start position worked as it should. When the ignition was set to "BOTH", "LEFT" or "RIGHT" I failed to see any current flow off the wires towards where the P-Leads should be.
From the left and right leads I returned the current back to the battery.
Am I:
1) wrong to close the circuit off the left and right ignition leads for my test scenario?
2) Should I actually expect to see power on the left or right leads in my scenario?
Thanks in advance!
John Marzulli
http://www.GenevieveMarzulli.org/
http://marzulli.smugmug.com/
http://701Builder.blogspot.com/
http://www.JohnMarzulli.net/
[quote][b]
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craig(at)craigandjean.com
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| Posted: Fri May 01, 2009 3:49 pm Post subject: Need some help with the ignition switch |
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A magneto switch doesn’t feed power to the mags through the P-leads. It only grounds them to kill one or both mags.
-- Craig
From: owner-zenith701801-list-server(at)matronics.com [mailto:owner-zenith701801-list-server(at)matronics.com] On Behalf Of John Marzulli
Sent: Friday, May 01, 2009 5:37 PM
To: zenith701801-list(at)matronics.com
Subject: Need some help with the ignition switch
I am using the ignition switch supplied by Zenith, sources from ACS.
Playing with it I wanted to do a quick hookup to a small 12V lantern battery and confirm how it is supposed to work using a multimeter. Using the diagram I hooked up some wires using test clips.
What I found was that the start position worked as it should. When the ignition was set to "BOTH", "LEFT" or "RIGHT" I failed to see any current flow off the wires towards where the P-Leads should be.
From the left and right leads I returned the current back to the battery.
Am I:
1) wrong to close the circuit off the left and right ignition leads for my test scenario?
2) Should I actually expect to see power on the left or right leads in my scenario?
Thanks in advance!
John Marzulli
http://www.GenevieveMarzulli.org/
http://marzulli.smugmug.com/
http://701Builder.blogspot.com/
http://www.JohnMarzulli.net/
| Quote: | | http://www.matronics.com/Navigator?Zenith701801-List |
0123456789
[quote][b]
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dougsnash
Joined: 14 Apr 2008
Posts: 281
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| Posted: Fri May 01, 2009 4:01 pm Post subject: Need some help with the ignition switch |
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John, most aircraft ignition switches ground the ignition to shut the engine down. In off, both P-Leads are grounded. In the right poistion, the left P-Lead is grounded, in the left position, the right P-Lead will be shorted to ground. You should not power this switch at all. Even the start terminal should be a path for the solenoid coil voltage to ground.
Hope this helps
Doug MacDonald
CH-701 Scratch Builder
NW Ontario, Canada
Final Assembly
Do Not Archive
--- On Fri, 5/1/09, John Marzulli <john.marzulli(at)gmail.com> wrote:
| Quote: | From: John Marzulli <john.marzulli(at)gmail.com>
Subject: Need some help with the ignition switch
To: zenith701801-list(at)matronics.com
Received: Friday, May 1, 2009, 6:37 PM
I am using the ignition switch supplied by Zenith, sources
from ACS.
Playing with it I wanted to do a quick hookup to a small
12V lantern battery
and confirm how it is supposed to work using a multimeter.
Using the diagram
I hooked up some wires using test clips.
What I found was that the start position worked as it
should. When the
ignition was set to "BOTH", "LEFT" or
"RIGHT" I failed to see any current
flow off the wires towards where the P-Leads should be.
>From the left and right leads I returned the current
back to the battery.
Am I:
1) wrong to close the circuit off the left and right
ignition leads for my
test scenario?
2) Should I actually expect to see power on the left or
right leads in my
scenario?
Thanks in advance!
John Marzulli
http://www.GenevieveMarzulli.org/
http://marzulli.smugmug.com/
http://701Builder.blogspot.com/
http://www.JohnMarzulli.net/
|
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craig(at)craigandjean.com
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| Posted: Fri May 01, 2009 4:02 pm Post subject: Need some help with the ignition switch |
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Here is some more information: The common off-left-right-both-start switch from Aircraft Spruce has two terminals on it labeled “GRD”. The shields on the p-leads connect to the GRD terminal in the center of the switch. I’ve attached a snippet from diagram Z-27 in the AeroElectric update on page 36 at the link below. The table shows what actually happens inside the switch.
https://matronics.com/aeroelectric/R12A/AppZ_12A3.pdf
-- Craig
From: owner-zenith701801-list-server(at)matronics.com [mailto:owner-zenith701801-list-server(at)matronics.com] On Behalf Of John Marzulli
Sent: Friday, May 01, 2009 5:37 PM
To: zenith701801-list(at)matronics.com
Subject: Need some help with the ignition switch
I am using the ignition switch supplied by Zenith, sources from ACS.
Playing with it I wanted to do a quick hookup to a small 12V lantern battery and confirm how it is supposed to work using a multimeter. Using the diagram I hooked up some wires using test clips.
What I found was that the start position worked as it should. When the ignition was set to "BOTH", "LEFT" or "RIGHT" I failed to see any current flow off the wires towards where the P-Leads should be.
From the left and right leads I returned the current back to the battery.
Am I:
1) wrong to close the circuit off the left and right ignition leads for my test scenario?
2) Should I actually expect to see power on the left or right leads in my scenario?
Thanks in advance!
John Marzulli
http://www.GenevieveMarzulli.org/
http://marzulli.smugmug.com/
http://701Builder.blogspot.com/
http://www.JohnMarzulli.net/
| Quote: | | http://www.matronics.com/Navigator?Zenith701801-List |
0123456789
| | - The Matronics Zenith701801-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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john.marzulli(at)gmail.co
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| Posted: Fri May 01, 2009 5:08 pm Post subject: Need some help with the ignition switch |
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Thanks,
That clears it up!
I was under the impression that power was flowing out of the switch to the p-leads closing a solenoid on them ( or something else ). It makes much more sense that power is flowing out of the mags to the P-Leads.
John Marzulli
http://www.GenevieveMarzulli.org/
http://marzulli.smugmug.com/
http://701Builder.blogspot.com/
http://www.JohnMarzulli.net/
On Fri, May 1, 2009 at 4:58 PM, Craig Payne <craig(at)craigandjean.com (craig(at)craigandjean.com)> wrote:
[quote]
Here is some more information: The common off-left-right-both-start switch from Aircraft Spruce has two terminals on it labeled “GRD”. The shields on the p-leads connect to the GRD terminal in the center of the switch. I’ve attached a snippet from diagram Z-27 in the AeroElectric update on page 36 at the link below. The table shows what actually happens inside the switch.
https://matronics.com/aeroelectric/R12A/AppZ_12A3.pdf
-- Craig
From: owner-zenith701801-list-server(at)matronics.com (owner-zenith701801-list-server(at)matronics.com) [mailto:owner-zenith701801-list-server(at)matronics.com (owner-zenith701801-list-server(at)matronics.com)] On Behalf Of John Marzulli
Sent: Friday, May 01, 2009 5:37 PM
To: zenith701801-list(at)matronics.com (zenith701801-list(at)matronics.com)
Subject: Need some help with the ignition switch
I am using the ignition switch supplied by Zenith, sources from ACS.
Playing with it I wanted to do a quick hookup to a small 12V lantern battery and confirm how it is supposed to work using a multimeter. Using the diagram I hooked up some wires using test clips.
What I found was that the start position worked as it should. When the ignition was set to "BOTH", "LEFT" or "RIGHT" I failed to see any current flow off the wires towards where the P-Leads should be.
From the left and right leads I returned the current back to the battery.
Am I:
1) wrong to close the circuit off the left and right ignition leads for my test scenario?
2) Should I actually expect to see power on the left or right leads in my scenario?
Thanks in advance!
John Marzulli
http://www.GenevieveMarzulli.org/
http://marzulli.smugmug.com/
http://701Builder.blogspot.com/
http://www.JohnMarzulli.net/
012 34567 89
[b]
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