Question about Farmall Cub Tractor Radiator

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I have a Farmall H and switch it over to a12volt system with a alternator with a built in regulator. I need a wiring diagram for this.

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  • Dennis Key
    Dennis Key Aug 14, 2012

    You should beable this diagram. This alt. has a built-in too.



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TRY THIS.I have a Farmall H and switch it over to a12volt - 12_4_2011_10_28_09_pm.jpg

Posted on Dec 04, 2011

  • danielcar164
    danielcar164 Aug 14, 2012

    I'm trying to find a diagram just like this but for a 140 farmall. but im trying this picture and hope it is helpfull Thanks!!!!


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You can get your alternator shop to make it a one wire alternator, so really all you need is a positive wire and ground to the frame. I got to be honest, I have convert many of them back to a 6 volt system, I use to set the point in the regulator to a 8 volt and install a eight volt battery. I didn\'t have to change much as the light and coil worked fine with it. There is a lot of stuff to change out when you change over to 12 volt system. Either way its hard on your starter. good luck

Posted on Jan 03, 2015

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My father used to have a Farmall H and it is a nice tractor. There is no wiring diagram for the built in alternator as it has no adjustment, it is preset. You will need to change your starter to a 12 volt starter, and if you have lights they will also need to be changed to 12 volt bulbs. I believe the tractor has a magneto so there is no modification there as it is independent and is not connected to the power. If it has a spark coil you will need a limiting resistor connected between your 12 volt power and spark coil. That is about it. I have rewired old Model As and a 37 Ford convertable to 12 Volt system and wired many trailers. I hope this helped and if I can assist you further please let me know.

Posted on Oct 08, 2009

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