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messydeer
Joined: 13 Feb 2006
Posts: 214
Location: Bellingham, WA
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 Posted: Thu Aug 06, 2009 10:05 pm Post subject: Magneto Wiring with 2-50 switches and toggle switch starting |
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Right now I'm starting to draw up my electrical schematic using Z-20 as a guideline for my Jabiru 3300. Z-20 shows a 1-3 switch for each ignition and a separate push starter switch. I read in chapter 11 of the AEC that a 2-50 switch could be used to combine the starter switch with one of the ignition switches, thereby eliminating one switch. I assume this would be a good idea, since it is one less thing to buy, install, and have break.
But I am a little confused on the wiring, both of this particular config and of magneto wiring in general. There is a diagram on p11-19 of AEC, but Z-17 doesn't show enough detail for me. It would be great if I could get the terminal connections for the two 2-50 (or 2-5) switches, including how the shields are wired at the engine. It also seems a 1-3 on-off switch would work for the right mag.
I've heard of 'O' and 'P' leads. As I understand it, the 'P' leads ground to kill the mags. They are shielded, but seems like I've heard both of grounding just one end and grounding both ends. Not clear on the physical grounding connections, either. If you're able to shed some light on this, that would be great!
Thanks,
Dan
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| please help me complete the switch to ignition wiring |
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mag, ignition, and starter wiring questions.pdf |
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jay(at)horriblehyde.com
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| Posted: Thu Aug 06, 2009 10:40 pm Post subject: Magneto Wiring with 2-50 switches and toggle switch starting |
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Hi there Dan,
I also considered using the 2-50 switches but decided to use a separate push
button to start because I like to have the ability to crank the engine
without the mags on; sometimes useful for troubleshooting and maintenance.
With the 2-50 switches you have to have both mags on to crank.
South African Jay
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messydeer
Joined: 13 Feb 2006
Posts: 214
Location: Bellingham, WA
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| Posted: Fri Aug 07, 2009 6:10 pm Post subject: Re: Magneto Wiring with 2-50 switches and toggle switch star |
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| Quote: | I also considered using the 2-50 switches but decided to use a separate push
button to start because I like to have the ability to crank the engine
without the mags on; sometimes useful for troubleshooting and maintenance.
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Good point, Jay  Others have also mentioned that, so I think I'll go with a push start that is separate from the mag switches. So that means I don't have to worry about how the wiring goes for the mag/starter switch combo anymore. Yippie!
And I think I understand how the mag wiring works now. I have dual mag ignitions in my Jab 3300. I was also told that they don't have impulse coupling either, which makes me wonder if one or both have the 'shower of sparks' type of starting mechanism. I've only glanced at that so far.
So I've put my thoughts on cyberpaper and with any luck there'll be a pdf file attached below. I do have one big question that came up while I was copying the mag drawings from Z-20. The right mag is shown wired to the switch differently than the left. I don't know why it is shown like that.
Take care,
Dan
PS: I goofed and uploaded 2 copies of the file. They're both the same.
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my magneto wiring with 1-3 switches.pdf |
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244.38 KB |
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360 Time(s) |
| Description: |
|
Download |
| Filename: |
my magneto wiring with 1-3 switches.pdf |
| Filesize: |
244.38 KB |
| Downloaded: |
329 Time(s) |
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Dan |
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messydeer
Joined: 13 Feb 2006
Posts: 214
Location: Bellingham, WA
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| Posted: Sat Aug 08, 2009 6:58 am Post subject: Re: Magneto Wiring with 2-50 switches and toggle switch star |
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| Quote: | | I do have one big question that came up while I was copying the mag drawings from Z-20. The right mag is shown wired to the switch differently than the left. I don't know why it is shown like that. |
Mystery solved. Ian sent me a version "L" of Z-20, which shows the mag switch wires being identical. I looked through both the rev. 12 and PPS on Bob's site and it showed "K" as the current version of the PDF. But then I went to the .dwg files and sure enough, there was version "L".
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