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12 Volt Generator Followup!

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Bill {Antique A

02-06-1999 21:21:29

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Thanks to everyone that answered to my post about the 12 volt generator. Please don't take this the wrong way! I know all about the effects that electical current have. I work with it all day long. I know that it sounds dumb to hook 12 volts up to a 6 volt starter. But it will not hurt it as long as you don't grind and grind on the starter all the time. I also know that a altenator works fine or they would not put them on cars. I had a specific reason for inquiring about a 12 volt generator for sale. It was to make it easier on me to put it under the hood where my altenator is not now. I restore antique tractor for money on the side I know all about how 6 and 12 volt work. I currently have a Farmall H, Cub, AC WD, JD A Unstyled, Case. Like I said I appreciate the respones, but no one that responded gave a answer to the post they were responding to. So if anyone has a 12 volt generator or a 6 volt generator that I can change over for a Farmall plese let me know. Once again I am not trying to be rude. I just want my question answered. Thanks! Bill {Antique Acres}

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sara

01-07-2005 22:46:51

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Re: 12 Volt Generator Followup! in reply to Bill {Antique Acres}, 02-06-1999 21:21:29

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John T Electrical Engineer

02-07-1999 18:00:37

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Re: 12 Volt Generator Followup! in reply to Bill {Antique Acres}, 02-06-1999 21:21:29

Hi there Antique Bill, Your question is right becauase regardless if you find a 6 volt or 12 volt generator, sticking a 12 volt regulator on it will make it charge a 12 volt battery. Ive done several and they all still work. The only difference is that the regulator must be for the type generator i.e., shunt wound or series wound. The GM Delco types need a GM regulator and Ford Autolite types need a Ford regulator. When you wrap wire around a piece of iron and pass current throught it, it creates an electromagnetic field (your field windings) and the more current the more field strength, and the faster RPM's you pass that armature through that field, the more voltage induced into its windings. The regulator just limits that field current by shutting it off (voltage regulator portion) or adding series resistance in series with it (current regulator portion). Therefore, using the right regulator you, as Gerald correctly pointed out, can make it charge 6 or 12 volts without having to change any armatures or field coils etc. Moral of story, buy any good old generator (6 or 12) and using the 12 volt regulator, you're in business. PS Dont forget to change any bulbs and add a ballast resistor in series with coil if you do go from 6 to 12 volts. John T Retired Electrical Engineer. Hope to see you at a show this summer in Southern Indiana.

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zane

02-07-1999 17:36:21

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Re: 12 Volt Generator Followup! in reply to Bill {Antique Acres}, 02-06-1999 21:21:29

I agree with Gerald. Automotive generators are generally shunt wound; the voltage tends to increase as the speed of rotation. A 12V "gatekeeper" (voltage regulator) should be all you need. If it doesn't keep your 12V battery charged, install a smaller pulley on the generator.

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Gerald

02-07-1999 07:03:30

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Re: 12 Volt Generator Followup! in reply to Bill {Antique Acres}, 02-06-1999 21:21:29

I learned long ago the hard way, that changing the windings is the super (and hardest) way to convert a generator's voltage. Then I went to college and learned that all I really needed to do was to spin the same windings faster. If I was going to make such a change today, I'd find a 12 volt regulator for a similar wiring connection and use it. If the generator didn't charge adequately at slow engine speeds, I'd change the generator pulley for a smaller one. I'd probably also remove the relay cutout from the regulator and install a big silicon diode. Did that in a regulator I built when installing a 12 volt bug engine in a 6 volt bug back in about 1968 and that generator charged like an alternator. And with the diode didn't have the battery wasting back current of the magnetic cutout. Of course with the 12 volt windings speed wasn't a problem.

Gerald

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John in Texas

02-07-1999 06:11:16

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Re: 12 Volt Generator Followup! in reply to Bill {Antique Acres}, 02-06-1999 21:21:29

I have several generators to choose from I did not see your original post so e-mail me details ....

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RickB.

02-07-1999 05:57:42

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Re: 12 Volt Generator Followup! in reply to Bill {Antique Acres}, 02-06-1999 21:21:29

I restored a Super C a couple of years ago & purchased a reman 12V Delco generator from the CaseIH dealer where I worked at the time. They may still be available. Listed for a F404 gas or something.

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Po Folks

02-07-1999 03:59:35

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Re: 12 Volt Generator Followup! in reply to Bill {Antique Acres}, 02-06-1999 21:21:29

I think people see one or two words in a post and start responding. If they would only read the complete post!

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