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Magnetos, Ignition Coils and Spark Plugs Discussion about magnetos, buzz coils, spark plugs, ignitors and low tension coils.

Magnetos, Ignition Coils and Spark Plugs

Magneto Charger Switch


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  #1  
Old 02-17-2018, 04:43:30 PM
W.P.Klein W.P.Klein is offline
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Default Magneto Charger Switch

Just bought a heavy duty American Bosch 12 volt mag charger at a local auction. It has no switch or disconnect on it, just battery cables. What would you recommend using for such? Does it need a condenser or capacitor in conjunction with the switch? Bill Klein
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Old 02-17-2018, 05:34:35 PM
LCJudge LCJudge is offline
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Default Re: mag charger switch

A nice heavy knife switch would work fine for it I’d think.
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Old 02-17-2018, 06:31:52 PM
Pat Huebsch Pat Huebsch is offline
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Default Re: mag charger switch

I put a push button starter switch on mine.

Pat
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Old 02-17-2018, 10:15:40 PM
John in Maryland John in Maryland is offline
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Default Re: Magneto Charger Switch

Mine has push button starter switch with a condenser across the terminals to prevent arcing.


J.I.M.
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Old 02-18-2018, 12:30:40 AM
stufforbud stufforbud is offline
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Default Re: Magneto Charger Switch

I've used a knife switch on mine for years and had no trouble.
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Old 02-20-2018, 06:16:47 PM
W.P.Klein W.P.Klein is offline
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Default Re: Magneto Charger Switch

Quote:
Originally Posted by John in Maryland View Post
Mine has push button starter switch with a condenser across the terminals to prevent arcing.


J.I.M.
Thank you all for responding. Any idea what size the condenser is J.I.M.?
It seems like most of you don't use a condenser. I read where it will do a better charging job with one because the flow thru the coils is interrupted more abruptly. Your thoughts everyone? Bill Klein
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Old 02-21-2018, 11:29:34 AM
John in Maryland John in Maryland is offline
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Default Re: Magneto Charger Switch

No, there's no writing on it. Looks like a regular old automotive condenser.
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Old 02-21-2018, 02:17:17 PM
Dick Brown Dick Brown is offline
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Default Re: Magneto Charger Switch

I have used a knife switch for years . Was original to the piece when I got . No problems . Dick
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Old 02-21-2018, 02:27:23 PM
Andrew Mackey Andrew Mackey is offline
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Exclamation Re: Magneto Charger Switch

A knife switch will work fine, as long as you remember to break the poles rapidly and as far as possible, to prevent flash. you want a heavy switch, double pole to help with the break. otherwise, a starter switch works great. A good auto supply, like NAPA, should be able to supply one.
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Old 02-21-2018, 03:04:20 PM
Vanman Vanman is offline
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Default Re: Magneto Charger Switch

I would be concerned about breakdown of the insulation in the windings of the coils without a condenser...

Most such similar circuits, like the field of motors or generators, employed a resistance that was placed across the field before the supply switch was opened. This would have been accomplished automatically via a switch with an extra contact. As the switch is opened, first the resistor is connected, then the supply is disconnected, leaving the resistor across the field. A make before break arrangement.
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