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Farmall cub wiring 1949 with magneto

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Dan

04-11-2004 18:25:37




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Got a really confusing situation. The wiring has been modified by other owners. To make matters worse. 6 volt with magneto but..... ..... ..they had a coil wired to this thing. Been looking at alot of schematics. Was this an oversight on my part?

Was it suppose to be this way????? BOB MELVILLE where are you????? ?????




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Dan

04-11-2004 19:34:45




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 Re: Farmall cub wiring 1949 with magneto in reply to Dan, 04-11-2004 18:25:37  
Thanks guys..... .been beginning to doubt my manhood on this subject. Now I know what to do!!! You're the best.



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Bob M

04-11-2004 19:15:49




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 Re: Farmall cub wiring 1949 with magneto in reply to Dan, 04-11-2004 18:25:37  
Dan - Here's what's happened:

Your Cub originally had a magneto. At some point in it's life the mag's coil failed. Rather than replacing the mag coil, someone wired up a battery ignition coil in it's place. The system now uses the mag's breaker points to time the ignition coil primary, while the mag distributor continues to distribute the spark voltage from the coil secondary same as before.

Consequently the low voltage wiring should be just like for a distributor ignition, except with the low voltage wire from the coil terminating at the breaker points inside the old magneto instead of inside a distributor.

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Bigdog

04-11-2004 19:14:43




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 Re: Farmall cub wiring 1949 with magneto in reply to Dan, 04-11-2004 18:25:37  
Dan, many cubs and other tractors were "field converted" when the magneto coil failed. Standard ignition coils were much cheaper than magneto coils to replace so many farmers replaced the mag kill or grounding switch with a standard 2 terminal switch with one lead going to the battery, the other going to the coil minus terminal, the coil plus terminal was then connected to the kill terminal on the side of the magneto distrubutor. The internal mag coil wire that went to the points was disconnected. So, your cub wiring should not be altered very much at all. Electrically, the circuit would look just like the diagram for a battery ignition tractor. There are cub wiring diagrams for both circuits on page 2 of the cub FAQ's on atis.net.

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Rudi

04-11-2004 18:52:48




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 Re: Farmall cub wiring 1949 with magneto in reply to Dan, 04-11-2004 18:25:37  
third party image

Dan:

Having a 6 volt Cub with a mag is not big deal and is very easy to rewire or straighten out the rats nest you have.

The manual server at the link below has the Blue Ribbon Service Manuals - GSS-1012 Electrical that has the diagram, the GSS-1411 Service Manual has the diagram and Cub FAQ's #2 has that information as well. You have to remember that the mag uses a cut out and not a regulator.

I am not too swift on the electrical stuff and I got it figured out, so if I can anybody can!

Hope this will help:

also Bob Melvilles stuff can be found at this url:
Link

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