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3brush-12V-sgle wire generator???

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David

06-14-1999 06:36:03

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When I got my 1945 2N it had a 6 volt, positive ground battery, no resistor, and a 3 brush, single wire generator with the Ford logo and V-12 stamped on it. I believe the tractor has a "cut-out relay" not a voltage regulator, as it's a sealed unit. It was going through batteries pretty fast so some time back my brother-in-law took off the generator to check it out. Then the battery kept going dead. I borrowed a digital volt meter and tested between the generator and ground and found zero volts... thanks to the archives, i tried repolarizing the generator, and now the voltmeter varies rapidly from 12 to 17 volts. So i suspect I'm gonna go from the dead battery routine back to the fried battery routine. I checked the archives and couldn't find anything about a 12V, 3 brush generator with single wire. I'm wondering if Ford ever made one or if previous owners "re-did" it somehow? Prior to checking the generator, I installed a new wiring harness (followed Neil's and Manuals diagrams) and installed a ballast resitor (which was missing), replaced plugs, points, condenser. What should i do now? 1. Install 6 volt Generator? (I kinda like the idea of staying original, and this seems the simplest but most costly option), 2. Install a 12 volt battery? (I think I would need two resistors and what else?) 3.Could the 12volt generator be converted to 6volts?. As you can probably guess I am not very experienced with electrical problems and really appreciate all your help...Thanks to this Board, the tractor runs better than it ever has.

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Elroyina

06-20-1999 10:30:51

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Re: 3brush-12V-sgle wire generator??? in reply to David, 06-14-1999 06:36:03

David,
I recognize you as my Father...Happy Father's Day from your favorite daughter on your favorite web site. You are a classic just like your car and your tractor. I love and admire you and thank you for always encouraging me to "Ford the rivers" and "plow my own roads"...

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Jack B. QUESTION for David

06-15-1999 09:21:02

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Re: 3brush-12V-sgle wire generator??? in reply to David, 06-14-1999 06:36:03

Did you happen to notice during this overcharge condition how many amps were indicated on your ammeter? Shouldn't have been more than about 7, I'd think, when things are working normally. If your generator is charging at the higher voltage you're talking about, it would have been roughly double.

--Jack B.

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Dav id

06-15-1999 10:31:04

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Re: Re: 3brush-12V-sgle wire generator??? in reply to Jack B. QUESTION for David, 06-15-1999 09:21:02

Jack,
I think a new ammeter is on my shopping list also... It is the original "inductive" type, and the needle just barely moves into the positive when the engine is running. Thanks,
David

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Jack B.

06-16-1999 11:38:05

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Re: Re: Re: 3brush-12V-sgle wire generator??? in reply to Dav id, 06-15-1999 10:31:04

Mmmmmm mmm. Not cooperating, is it? ":o)

--Jack B.

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Dell (WA)

06-14-1999 07:28:01

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Re: 3brush-12V-sgle wire generator??? in reply to David, 06-14-1999 06:36:03

David..... ...I'm not a 3-brush generator "expert" but it is my understanding, that the 3rd brush is your most likely cause of your 12-17 volts. It is eather "stuck", mis-adjusted, or worn-out. If you can find an old time generator repair shop, they should beable to fix it. If not, you'll probably have to bite the bullet, an buy a rebuilt generator.

As you have "discovered", charging a 6 volt battery with 12 volts, is hard on the ol' battery. Boils out all the water and warps the plates.

I'm not certain what to make of the "V-12" stamp.

Hope this helps..... ...Dell

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David

06-14-1999 16:14:13

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Re: Re: 3brush-12V-sgle wire generator??? in reply to Dell (WA), 06-14-1999 07:28:01

Thanks a lot Dell. Guess I will break out the yellow pages and see if I can find someone to repair it...Sometimes I cant see the forest for the trees, seems I get so wrapped up in options that I forget the obvious....If I can't get it fixed, I'll be back; asking where to get a rebuilt...

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Jim WI

06-16-1999 10:59:54

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Re: Re: Re: 3brush-12V-sgle wire generator??? in reply to David, 06-14-1999 16:14:13

One more question first.

Do you see the 12 to 17 volts at the battery or just at the generator.

If just at the generator I think you've a bad cutout.

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Dan Hill

06-20-2005 05:10:01

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Re: Re: Re: Re: 3brush-12V-sgle wire generator??? in reply to Jim WI, 06-16-1999 10:59:54

Check the cutout.The generator armature will short out running at no load.The cutout is a simple relay.Take the cover off, see if the points close when the engine is running.If not the fine wire pull in coil is open.

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