Wiring Diagram - Magneto Equipped 1950

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Wiring Diagram - Magneto Equipped 1950

Postby Brian50 » Sun Aug 18, 2013 3:13 pm

I don't have a magneto ignition wiring diagram for my 1950 Cub. I think I understand why I don't have any spark, but I don't want to take a chance on burning something out. A medium diameter yellow wire runs to the back of the lighting switch from the front terminal of the voltage regulator. Right now, the end of the yellow wire is wrapped with electrical tape and is NOT connected to the regulator terminal. I assume the yellow wire should be connected to that regulator terminal. I don't know why the previous owner used the tape, but I assume he wrapped the whole connection, and it has just come loose. 2nd question: am I correct that the single-terminal "ignition" switch is simply a kill switch? (And that the green wire between the side of the magneto and the kill switch carries the "kill" message?) Thanks for the help.
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Re: Wiring Diagram - Magneto Equipped 1950

Postby Eugene » Sun Aug 18, 2013 5:32 pm

Operator's Manuals, top of page. Manuals contain wiring diagrams. The 1955 manual contains several wiring diagrams, including magneto ignition. You may need to search several operator's manuals or the service manual to come up with the correct wiring diagram for you tractor.

The magneto kill switch located on the dash simply grounds out the magneto.
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Re: Wiring Diagram - Magneto Equipped 1950

Postby bob in CT » Sun Aug 18, 2013 5:36 pm

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Re: Wiring Diagram - Magneto Equipped 1950

Postby Rudi » Sun Aug 18, 2013 5:44 pm

Brian:

Is it a Magneto and a Cut-out or a Magneto with a Regulator
Image

a Magneto with a Regulator
Image


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Re: Wiring Diagram - Magneto Equipped 1950

Postby Brian50 » Sun Aug 18, 2013 8:47 pm

Thanks all. The pdf diagram "6 volt magneto ignition below sn 210,000" shows my system. The disconnected wire on the front voltage regulator terminal on my Cub explains why the lights don't work. However, it seems that as long as the ignition/kill switch is "on" (pulled out) I should get sparks. What should I look for now??
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Re: Wiring Diagram - Magneto Equipped 1950

Postby Cecil » Sun Aug 18, 2013 9:07 pm

The mag is independent of the electrical system. The wire from the switch to the mag just throws a ground to the mag to shut it off. Try unhooking the wire from the mag in case the switch is bad. Then go points and condenser, then coil in that order.
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Re: Wiring Diagram - Magneto Equipped 1950

Postby Brian50 » Mon Aug 19, 2013 12:13 pm

Thanks to the pdf wiring diagram and my own very, very slow reasoning process, I became suspicious that the magneto was indeed independent of the rest of the electrical system - thanks, Cecil, for confirming that. If I've got it right (except for the starter motor) I shouldn't even need a battery to get good sparks. I am not getting anything. I confirmed that the magneto was grounded out with the kill switch closed. It was STILL grounded out with the kill switch pulled out (open). So I assumed that the switch was bad and disconnected the wire from the mag as suggested. Here's my new mystery: the terminal on the mag still shows it's grounded out - zero ohms between it and ground. What the heck does that mean?! (I haven't gone to the points, etc. yet.)
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Re: Wiring Diagram - Magneto Equipped 1950

Postby John *.?-!.* cub owner » Mon Aug 19, 2013 12:49 pm

If the points are closed it will still show a ground, in the range of 1 or 2 ohms.
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Re: Wiring Diagram - Magneto Equipped 1950

Postby Eugene » Mon Aug 19, 2013 1:31 pm

Brian50 wrote:Here's my new mystery: the terminal on the mag still shows it's grounded out - zero ohms between it and ground. What the heck does that mean?!
John *.?-!.* cub owner wrote:If the points are closed it will still show a ground, in the range of 1 or 2 ohms.
Normal. It will also display low ohm's reading because one primary wire of the coil winding, one side of the condenser, and one side of the points are attached to the terminal on the side of the magneto.

Depending on magneto internal wiring, points open or closed there are several other paths to ground besides the points.
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Re: Wiring Diagram - Magneto Equipped 1950

Postby dgrapes59 » Mon Aug 19, 2013 8:03 pm

Welcome to the forum!
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Re: Wiring Diagram - Magneto Equipped 1950

Postby Rudi » Mon Aug 19, 2013 8:07 pm

Besides the points, check the lug .. make sure the insulating washers are there to isolate it from the case.
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