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Discussion Forum
:

Farmall C 12-volt Conversion with Magneto

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Keven McNeice

12-24-2011 13:41:12




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Hello everyone, Merry Christmas,

I have a Farmall C with electrical issues. It
runs, but will not charge. It has a Magneto and a
Delco-Remy alternator. Not sure if I have to have a distributor for a 12 volt system, but this is how i got the tractor.

I followed the 12 volt
conversion diagram for everything but the wires
that go to and come from the IGN switch, which is
where I followed the 6 Volt Diagram, and left the
Number one terminal alone.

See 12 volt Diagram here:
www.productionfield.com/Extra/05-

12vAlternatorConv-rev4_22_08.gif

See 6 volt Diagram here:
www.productionfield.com/Extra/04-

6VoltCutoutAndMagneto-rev4_17-1.gif

I was curious if anyone had a suggestion for what
I should do? We have tested to see if it charges
at the alternator, from the Bat terminal to ground
and only got what the battery had (11.95 volts)

Also, the tractor runs at an inconsistent RPM
occasionally. Could that be spark plug problems? I
have replaced the rings, honing the sleeves in the
process. The spark plugs are newer but were used
when I had a busted oil ring on the number 2
cylinder so I will replace them unless someone suggests another approach.

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Janicholson

12-24-2011 19:05:54




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 Re: Farmall C 12-volt Conversion with Magneto in reply to Keven McNeice, 12-24-2011 13:41:12  
third party image

This will do it. Never apply any voltage to the mag. That one wire switch is a ground to stop open to run switch. Jim



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El Toro

12-24-2011 14:15:13




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 Re: Farmall C 12-volt Conversion with Magneto in reply to Keven McNeice, 12-24-2011 13:41:12  
Your alternator or generator is only used to charge your battery. Since you have a mag it doesn't require any battery voltage. Don't run any battery voltage to your mag. You still need your switch that ground's the mag when shutting down the engine. You need to look on some of the earlier posts by Bob M or John T for their wiring diagrams when wiring an alternator. You should see around 14 volts across the battery terminals with the engine at 1/2 throttle or better. Hal

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