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Wiring a MAG Toggle Switch

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msteffensen(at)ups.com
Guest

Posted: Thu Feb 01, 2007 4:31 am Post subject: Wiring a MAG Toggle Switch

Bob, 



I am using your Dual Alt & Dual Buss setup in my RV10 with one mag

(Left)and the lightspeed ignition system. I bought a switch from B&C

it's a on and off switch, (2 terminal).



I am confused on wiring the toggle switch.



Based on your the diagrams, I belive that I install the switch with the

keyway up and the wire runs between the switch (terminal 1) and MAG, the

shielding is attached to the other terminal (#2) on the switch and a

grounding screw on the MAG. 



As I understand, the MAG live when the switch in open and it's dead when

the switch is to ground. 



Please advise as I don't want the MAG live when I think it's dead.



Thanks....Mark Steffensen

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nuckollsr(at)cox.net
Guest

Posted: Thu Feb 01, 2007 7:31 am Post subject: Wiring a MAG Toggle Switch

At 07:24 AM 2/1/2007 -0500, you wrote:



 	  Quote: 	
		  



Bob,



I am using your Dual Alt & Dual Buss setup in my RV10 with one mag

(Left)and the lightspeed ignition system. I bought a switch from B&C

it's a on and off switch, (2 terminal).



I am confused on wiring the toggle switch.



Based on your the diagrams, I belive that I install the switch with the

keyway up and the wire runs between the switch (terminal 1) and MAG, the

shielding is attached to the other terminal (#2) on the switch and a

grounding screw on the MAG.



As I understand, the MAG live when the switch in open and it's dead when

the switch is to ground.



Please advise as I don't want the MAG live when I think it's dead.


	


    Yes . . . to turn OFF a magneto, you CLOSE a switch to make

    a connection that kills the mag.



    So check your switch with an ohmmeter and orient it in

    the panel such that it is CLOSED with the toggle in the

    down position.



    I didn't know B&C was selling any two-terminal switches.

    When I sold them that part of my business, I carried only

    the three-terminal, SPDT style switches so that ANY function

    could be achieved irrespective of the keyway position. This

    allowed a builder to install keyway lock washers all facing in

    the same direction. In this case, you MIGHT find that the

    switch you purchased will be "upside down" compared to other

    switches on the panel.



    Bob . . .



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

        ( IF one aspires to be "world class",  )

        ( what ever you do must be exercised   )

        ( EVERY day . . .                      )

        (                  R. L. Nuckolls III  )

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

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msteffensen(at)ups.com
Guest

Posted: Thu Feb 01, 2007 10:44 am Post subject: Wiring a MAG Toggle Switch

Bob, 



Do I need to take one of the terminals of the switch to a firewall

ground so that when the switch in open the MAG is grounded and when the

switch is closed the MAG is not grounded or does the switch have this

function without taking a terminal to a grounding point?

 

Subject:      Re: Wiring a MAG Toggle Switch 

From:      Robert L. Nuckolls, III (nuckollsr(at)cox.net) 

Date:      Thu Feb 01 - 7:31 AM 



At 07:24 AM 2/1/2007 -0500, you wrote:



 	  Quote: 	
		  

Bob,



I am using your Dual Alt & Dual Buss setup in my RV10 with one mag

(Left)and the lightspeed ignition system. I bought a switch from B&C

it's a on and off switch, (2 terminal).



I am confused on wiring the toggle switch.



Based on your the diagrams, I belive that I install the switch with the

keyway up and the wire runs between the switch (terminal 1) and MAG,

the
	


 	  Quote: 	
		  shielding is attached to the other terminal (#2) on the switch and a

grounding screw on the MAG.



As I understand, the MAG live when the switch in open and it's dead

when
	


 	  Quote: 	
		  the switch is to ground.



Please advise as I don't want the MAG live when I think it's dead.


	


    Yes . . . to turn OFF a magneto, you CLOSE a switch to make

    a connection that kills the mag.



    So check your switch with an ohmmeter and orient it in

    the panel such that it is CLOSED with the toggle in the

    down position.



    I didn't know B&C was selling any two-terminal switches.

    When I sold them that part of my business, I carried only

    the three-terminal, SPDT style switches so that ANY function

    could be achieved irrespective of the keyway position. This

    allowed a builder to install keyway lock washers all facing in

    the same direction. In this case, you MIGHT find that the

    switch you purchased will be "upside down" compared to other

    switches on the panel.



    Bob . . .



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

        ( IF one aspires to be "world class",  )

        ( what ever you do must be exercised   )

        ( EVERY day . . .                      )

        (                  R. L. Nuckolls III  )

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

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nuckollsr(at)cox.net
Guest

Posted: Thu Feb 01, 2007 11:10 am Post subject: Wiring a MAG Toggle Switch

At 01:42 PM 2/1/2007 -0500, you wrote:



 	  Quote: 	
		  



Bob,



Do I need to take one of the terminals of the switch to a firewall

ground so that when the switch in open the MAG is grounded and when the

switch is closed the MAG is not grounded or does the switch have this

function without taking a terminal to a grounding point?


	


   You wire it per the diagrams where p-lead shields are

   grounded to the mag or engine under the cowl. The switch

   USES the shield to provide a ground at the panel. The diagram

   is explicit as to how shields are handled and grounds supplied.

   Bob . . .

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mprather(at)spro.net
Guest

Posted: Thu Feb 01, 2007 12:02 pm Post subject: Wiring a MAG Toggle Switch

No 'grounding' of the mag system is required.  Closing the mag switch

causes one end of the p-lead winding to be connected to the other end of

the p-lead winding (in a slightly roundabout way) which disables the

magneto from sparking..  From the standpoint of wiring the switch, it's

only a bit of a coincidence that one end of the p-lead winding is also

connected to the magneto body which is bolted to the engine case which on

most airplanes is known as 'ground'..



So, the closed switch should connect the p-lead (the 'free end' of the

'primary' winding) to the body of the magneto.  No additional connections

required.  And, this method of wiring offers the lowest risk of p-lead

noise to other electronics in the airplane..

Regards,



Matt-



 	  Quote: 	
		   



 Bob,



 Do I need to take one of the terminals of the switch to a firewall

 ground so that when the switch in open the MAG is grounded and when the

 switch is closed the MAG is not grounded or does the switch have this

 function without taking a terminal to a grounding point?



 Subject:      Re: Wiring a MAG Toggle Switch

 From:      Robert L. Nuckolls, III (nuckollsr(at)cox.net)

 Date:      Thu Feb 01 - 7:31 AM



 At 07:24 AM 2/1/2007 -0500, you wrote:



>

>Bob,

>

>I am using your Dual Alt & Dual Buss setup in my RV10 with one mag

>(Left)and the lightspeed ignition system. I bought a switch from B&C

>it's a on and off switch, (2 terminal).

>

>I am confused on wiring the toggle switch.

>

>Based on your the diagrams, I belive that I install the switch with the

>keyway up and the wire runs between the switch (terminal 1) and MAG,

 the

>shielding is attached to the other terminal (#2) on the switch and a

>grounding screw on the MAG.

>

>As I understand, the MAG live when the switch in open and it's dead

 when

>the switch is to ground.

>

>Please advise as I don't want the MAG live when I think it's dead.



     Yes . . . to turn OFF a magneto, you CLOSE a switch to make

     a connection that kills the mag.



     So check your switch with an ohmmeter and orient it in

     the panel such that it is CLOSED with the toggle in the

     down position.



     I didn't know B&C was selling any two-terminal switches.

     When I sold them that part of my business, I carried only

     the three-terminal, SPDT style switches so that ANY function

     could be achieved irrespective of the keyway position. This

     allowed a builder to install keyway lock washers all facing in

     the same direction. In this case, you MIGHT find that the

     switch you purchased will be "upside down" compared to other

     switches on the panel.



     Bob . . .



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

         ( IF one aspires to be "world class",  )

         ( what ever you do must be exercised   )

         ( EVERY day . . .                      )

         (                  R. L. Nuckolls III  )

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

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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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