Re: Converting 6 volt Farmall A System to 12 volt?

Posted by buck on July 01, 2003 at 17:55:22 from (209.240.198.63):

In Reply to: Converting 6 volt Farmall A System to 12 volt? posted by Gary W Doyle on July 01, 2003 at 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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