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Converting 6 volt Farmall A System to 12 volt?

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Gary W Doyle

07-01-2003 15:23:07




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Greetings from Alaska
My new (to me) Farmall A has a 12 volt battery, starter and lights (positive ground), but looks as if the generator is the original 6 volt. The previous owner just jump started the tractor when he used it. Anyone know of a bolt on 12 volt replacement or has experience with rewinding and converting the original 6 to 12?
Thanks GWD




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Doug in OR

07-01-2003 19:47:59




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 Re: Converting 6 volt Farmall A System to 12 volt? in reply to Gary W Doyle, 07-01-2003 15:23:07  
If it works fine, leave good enough alone. If you are going to make changes, first of all you should change that to a negative ground system. Not a hard thing to do, and your electrical system will be more compatible with other options - electronic ignition for one.

If you decide to install an alternator (recommended), you will need negative ground anyway. Try using the Delco 10SI alternator. It is availabe and inexpensive. If you do not have the space for a 10SI, you can install a Delco CS-121. This alternator was used in GM vehicles from 1986 to 1996. It should start becoming available at salvage yards near you. Look for it in the small GM cars.

Read up on 12 volt conversions in the "Articles" section to the left of this page. There is lots of good info there.

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kev@ia

07-01-2003 18:59:23




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 Re: Converting 6 volt Farmall A System to 12 volt? in reply to Gary W Doyle, 07-01-2003 15:23:07  
460 and 560 came with 12v generators, unless looking perfect is important leave the fan on the unit though.



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Jim

07-01-2003 17:55:41




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 Re: Converting 6 volt Farmall A System to 12 volt? in reply to Gary W Doyle, 07-01-2003 15:23:07  
I have changed several farmalls to a 12 volt system. I have used a delco alternator with a built-in voltage regulator. With this system, some new wiring is required. I have used flat iron {short pieces} to make mounting brackets so the pulleys will align. You will have to change
to a 12 volt coil or put a resistor in the hot wire before connecting to the coil if using a 6 volt coil.



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buck

07-01-2003 17:55:22




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 Re: Converting 6 volt Farmall A System to 12 volt? in reply to Gary W Doyle, 07-01-2003 15:23:07  

Sounds like there may have been a prior attempt to change the generator to 12v. I would start with a simple check of the output of the existing charging system by starting the engine and then disconnecting the ground at the battery and check voltage across the 2 battery leads.With above idle speeds and 14+v you are in good shape and probable have battery problems.With between 7v and 12v there probaby was an attempt to convert but the sytem needs some attention. With 7v or less the system is still 6v. Of course if the engine will not run without the battery (possible mag.would run without current from generator or battery) then the system needs attention. All can corrected by taking the generator and VR to a repair shop and telling them what you desire the end result to be. SOME shops CAN convert some 6v generators to 12v so you will have to check with your local shop for this.An alternative is to use a more modern alternator and in this case I would suggest that you buy a kit with instructions or have your local shop prepare an alternator for your application. A few areas of caution here: First on the generator-after conversion will it produce enough amperage to satisfy your electrical needs. On the alternator-they all are NOT created equal and require different wireing methods and many of these wireing methods create problems like draining the battery when the engine isn't running. Alternator shops can prepare you a true one-wire alternator that will charge from idle and not drain the battery or cause a coil ignition to run on after the key is cut off.

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