info/help re magneto switch

hardtimes

hardtimes

Well-known member
I have an upright magneto on top of my B engine. As you T guys probably know, the mag needs to be grounded to stop engine when running.
I found out that it is not a good practice to take hold of the bare end of grounding wire :rolleyes: !
Hands too shaky to put the ground on quickly.
Can anyone recommend a good source for an old time type kill/ground switch for this job ? Anyone have any such switch that I can buy from you :confused:
Trying to ground this out (pic):
 

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Any switch will work. One lead to the mag stop post & the other to ground. I have a Buick with a magneto & the stop switch is a push button starter switch - you push & hold the button to stop the car. That way you cannot forget to turn it back on to start again.
 
Jack Innes said:
Any switch will work. One lead to the mag stop post & the other to ground. I have a Buick with a magneto & the stop switch is a push button starter switch - you push & hold the button to stop the car. That way you cannot forget to turn it back on to start again.
Click to expand...

Hey Jack,
Wow, great help and information :) !
Does such a switch have to have a certain amount of capacity (ohms/what)?
 
The switch would be grounding the low tension side of the magneto. Any regular automotive switch should do fine. The switch on my Buick looks to be a starter button intended for an inboard boat.

Often a key switch is used for security.

The shock you received was likely feedback of sorts caused by your body not being a true ground.
 
You just need to re - wire your ignition switch to control a normally closed relay that grounds the magneto when power is off. eBay is a good place to find a normally closed 12 volt relay.


hardtimes said:
I have an upright magneto on top of my B engine. As you T guys probably know, the mag needs to be grounded to stop engine when running.
I found out that it is not a good practice to take hold of the bare end of grounding wire :rolleyes: !
Hands too shaky to put the ground on quickly.
Can anyone recommend a good source for an old time type kill/ground switch for this job ? Anyone have any such switch that I can buy from you :confused:
Trying to ground this out (pic):
Click to expand...
 
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