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Farmall Super C 6 volt vs 12 volt


 
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Retcol
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PostPosted: Thu Jan 08, 2009 6:13 pm    Post subject: Farmall Super C 6 volt vs 12 volt Reply to specific post Reply with quote

The continuing saga of the 6 volt vs 12 volt. I took the voltage regulator off and I noticed that 6 volt pos was stamped on the back side. If it is 6 volt, why is there a resistor block on the tractor?
 
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Janicholson
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Joined: 30 Jan 2004
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Location: St. Cloud, MN

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PostPosted: Thu Jan 08, 2009 6:32 pm    Post subject: Re: Farmall Super C 6 volt vs 12 volt Reply to specific post Reply with quote

If a 12 volt battery is put in a 6v system, the coil will get 12 volts. The generator will never make enough voltage to close the cutout relay, and life goes on. The owner just charged the battery as needed and all was well.

The system can be 6 volt pos ground, just take the resistor out and connect the leads together (or put in a new wire from the ignition switch/button, and it probably will be fine as is. Flash (polarize) the gen and go from there. We are out here to make it go. JimN
 
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barn E
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PostPosted: Thu Jan 08, 2009 6:33 pm    Post subject: Re: Farmall Super C 6 volt vs 12 volt Reply to specific post Reply with quote

Experimental model??? Ford 9N had ballast resistor with 6 volt. Somebody thought you needed one??? Will it start Ok on 6 volt? If so I would go with that. Make changes in that direction. If you ever sell, first thing somebody thinks with 12 volt is that compression is low and hard to start. If compression is low and hard to start, then go with the 12 volt or rebuild.
 
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Bob M
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PostPosted: Thu Jan 08, 2009 6:36 pm    Post subject: Re: Farmall Super C 6 volt vs 12 volt Reply to specific post Reply with quote

My guess is the original 6 volt charging system quit working long ago. To get the tractor running again quickly (and cheaply...) the owner simply stuck in a 12 volt battery, added a ballast resistor to the coil circuit and left the inoperative generator/regulator in place.

He then used the tractor like this. And when the battery went down he'd simply stick it on a charger overnite.
 
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Janicholson
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PostPosted: Thu Jan 08, 2009 6:41 pm    Post subject: Re: Farmall Super C 6 volt vs 12 volt Reply to specific post Reply with quote

FOrd realized that the drop in voltage when starting, using a 6 volt system could be made better by using a 4 volt coil, and when starting feed voltage directly to it. Then when running use a ballast resistor to drop the 7+ volts to ~4volts. Exact same rationalle that many companies used to drop 12 volts to 6 with a ballast resistor. The 6v ford coil is actually a 4 volt. (I hope this does not muddy the water further) JimN
 
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Janicholson
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PostPosted: Thu Jan 08, 2009 6:42 pm    Post subject: Re: Farmall Super C 6 volt vs 12 volt Reply to specific post Reply with quote

You bet, See below. Jim Smile
 
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