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Jabiru Magneto Wiring

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messydeer

Joined: 13 Feb 2006
Posts: 214
Location: Bellingham, WA

Posted: Thu Nov 05, 2009 4:48 pm Post subject: Jabiru Magneto Wiring

Hello!



The Jabiru manual doesn't say much about the mag wiring. On each of my coils, there is a 1/4" faston tab. I have 20awg shielded wire for each ignition. I've read through the Book and understand when the mags are ungrounded, they are hot. Flipping the mag switch off completes the ground ground and kills the mag.



I've attached a doc that shows what I understand and what I don't. Quotes are from Bob's book in Note 3 of the Z appendix, I believe:



1. "Attach the shield to one and only one switch terminal at the cockpit end..."    



How do I do this? I can strip off the outer insulation and expose the braided shield. For a 20awg wire, using a 16awg stripper is about right. That's about as far as my brain will take me. Seems like I would splice the outer braid to a wire, and connect that wire via faston to terminal #2 of the switch. Another faston would go on the inner wire and connect to terminal #3. I just don't know how.



2.  "Attach the shield to engine ground at the magneto end."



The drawing shows shield going to one spot on the ignition and the inner wire going to another. I have just the faston tab of the coil. How is this done?

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Dan

messydeer

Joined: 13 Feb 2006
Posts: 214
Location: Bellingham, WA

Posted: Thu Nov 05, 2009 4:56 pm Post subject: Re: Jabiru Magneto Wiring

I also just read this searching through the Yahoo Jab group:



"...at the switch end,

you should connect both L and R shield grounds together (but not to

anything else but the switch), for redundancy, in case of a break in

one of the ground leads, you can still shut off the engine. This

should not cause a ground loop/noise problem..."

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_________________
Dan

nuckolls.bob(at)aeroelect
Guest

Posted: Fri Nov 06, 2009 8:41 am Post subject: Jabiru Magneto Wiring

At 06:48 PM 11/5/2009, you wrote:

 	  Quote: 	
		  



Hello!



The Jabiru manual doesn't say much about the mag wiring. On each of 

my coils, there is a 1/4" faston tab. I have 20awg shielded wire for 

each ignition. I've read through the Book and understand when the 

mags are ungrounded, they are hot. Flipping the mag switch off 

completes the ground ground and kills the mag.



I've attached a doc that shows what I understand and what I don't. 

Quotes are from Bob's book in Note 3 of the Z appendix, I believe:



1. "Attach the shield to one and only one switch terminal at the 

cockpit end..."



How do I do this? I can strip off the outer insulation and expose 

the braided shield. For a 20awg wire, using a 16awg stripper is 

about right. That's about as far as my brain will take me. Seems 

like I would splice the outer braid to a wire, and connect that wire 

via faston to terminal #2 of the switch. Another faston would go on 

the inner wire and connect to terminal #3. I just don't know how.



2.  "Attach the shield to engine ground at the magneto end."



The drawing shows shield going to one spot on the ignition and the 

inner wire going to another. I have just the faston tab of the coil. 

How is this done?


	


   See:



http://aeroelectric.com/articles/shldwire/shldwire.html



   Put faston female on engine end of center conductor

   and install on magneto coil tab. Put ring terminal on

   engine end shield and take to crankcase ground via

   mounting bolt (on ignition coil?). If necessary, slice

   onto the shield to extend to nearest practical mounting

   bolt. NOTE "mounting bolt" means some fastener that holds

   detail parts and/or accessories on the engine. This does

   not mean any bolt with a critical torque value

   for the maintenance of structural integrity. I

   once had a guy remove a head-bolt to "ground" some

   wire to his engine!



   Attach other end of shielded wire to switch. Prepare

   ends the same way. Install fast-on or ring terminals

   as appropriate. Connect so that the wire and shield

   are connected to each other when the ignition switch

   is closed (OFF).

        Bob . . .



         ---------------------------------------

        ( It's MATRONICS FUND RAISER MONTH!    )

        ( Do your part to keep this marvelous  )

        ( tool sharp and available to all our  )

        ( brothers in the OBAM aviation        )

        ( community.                           )

         ---------------------------------------

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messydeer

Joined: 13 Feb 2006
Posts: 214
Location: Bellingham, WA

Posted: Fri Nov 06, 2009 12:24 pm Post subject: Re: Jabiru Magneto Wiring

Thanks, for running down that article, Bob. Not sure how I missed it. Nice, easy to understand article.

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_________________
Dan

nuckolls.bob(at)aeroelect
Guest

Posted: Fri Nov 06, 2009 12:43 pm Post subject: Jabiru Magneto Wiring

At 06:56 PM 11/5/2009, you wrote:

 	  Quote: 	
		  



I also just read this searching through the Yahoo Jab group:



"...at the switch end,

you should connect both L and R shield grounds together (but not to

anything else but the switch), for redundancy, in case of a break in

one of the ground leads, you can still shut off the engine. This

should not cause a ground loop/noise problem..."


	


   This refers to the O-L-R-B-S key-switch and is not

   applicable to the use of toggles and push-button.

        Bob . . .



         ---------------------------------------

        ( It's MATRONICS FUND RAISER MONTH!    )

        ( Do your part to keep this marvelous  )

        ( tool sharp and available to all our  )

        ( brothers in the OBAM aviation        )

        ( community.                           )

         ---------------------------------------

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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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