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RJSw/NAA
New User
Joined: 25 Sep 2012
Posts: 12
Location: Dillsburg,PA
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 Posted: Tue Sep 25, 2012 6:55 am Post subject: 6 volt or 12 volt generator |
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I am Pulling some parts from a non running NAA to a still using 6 volt Jubilee. The NAA is definitely converted to 12 volt but the generator has three wires going from it and looks like the original, cast iron front. There are no numbers on it. Did older generators 6 and 12 both look the same? OR did whoever made this conversion leave the old 6 volt in? How do I tell what voltage a generator is?
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souNdguy
Tractor Guru
Joined: 20 Aug 2002
Posts: 48134
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| Posted: Tue Sep 25, 2012 7:13 am Post subject: Re: 6 volt or 12 volt generator |
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a 12v genny should have a cooling slot at the back.. may have a band around it hiding it.
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JMOR
Tractor Guru
Joined: 13 Aug 2007
Posts: 12793
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| Posted: Tue Sep 25, 2012 7:15 am Post subject: Re: 6 volt or 12 volt generator |
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| RJSw/NAA wrote: | | (quoted from post at 10:55:32 09/25/12) I am Pulling some parts from a non running NAA to a still using 6 volt Jubilee. The NAA is definitely converted to 12 volt but the generator has three wires going from it and looks like the original, cast iron front. There are no numbers on it. Did older generators 6 and 12 both look the same? OR did whoever made this conversion leave the old 6 volt in? How do I tell what voltage a generator is? |
!2v generators of the next gen diesel tractors had a pulley fan & cooling slots at rear of barrel. Any 6 v can be modified into a 12v. Measure resistance of field coils with Ohmmeter connected from Field terminal to case ground & if about 2 to 4 Ohms, it is a 6v & if about twice that, then a 12v. I did say 'about'. Such a rule of thumb does not apply to 100 ampere fire truck/ambulance generators & the like.
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RJSw/NAA
New User
Joined: 25 Sep 2012
Posts: 12
Location: Dillsburg,PA
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| Posted: Tue Sep 25, 2012 10:24 am Post subject: Re: 6 volt or 12 volt generator |
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It does have a band around it at the back.
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JMOR
Tractor Guru
Joined: 13 Aug 2007
Posts: 12793
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| Posted: Tue Sep 25, 2012 10:31 am Post subject: Re: 6 volt or 12 volt generator |
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| RJSw/NAA wrote: | | (quoted from post at 14:24:06 09/25/12) It does have a band around it at the back. |
Someone could have added a band, but not factory. Pictured, NAA &/or hundred series 6v followed by 12v hundred series diesel.
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souNdguy
Tractor Guru
Joined: 20 Aug 2002
Posts: 48134
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| Posted: Tue Sep 25, 2012 2:17 pm Post subject: Re: 6 volt or 12 volt generator |
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sounds like a stealth conversion to 12v with a gen off a 59-64 diesel
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Tony Jacobs
Long Time User
Joined: 22 Sep 2007
Posts: 762
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| Posted: Tue Sep 25, 2012 8:20 pm Post subject: Re: 6 volt or 12 volt generator |
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Hello JMOR, You are very close all 6 Volt Generators(made 1953-1965) look as your photo and are sealed front and rear of case . Your 12 Volt Gen. photo is a Car or Truck Generator which ALL HAVE FOUR SLOTS in the rear of the case . Original Ford Diesel Tractor 12 Volt Gen.(made from 1958-1965 , no diesels in the hundred series) have ONLY ONE SLOT in the rear of the case pointing downward . The bands are generally on REMANUFACTURED UNITS(because car, truck, and tractors are the same case design except the cooling slots) from Ford or many of the Brand Name Rebuilders to keep the water out of them when installed in Tractors or other Ford Industrial applications . THANKS TONY
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JMOR
Tractor Guru
Joined: 13 Aug 2007
Posts: 12793
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| Posted: Wed Sep 26, 2012 8:55 am Post subject: Re: 6 volt or 12 volt generator |
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| TONY JACOBS wrote: | | (quoted from post at 00:20:53 09/26/12) Hello JMOR, You are very close all 6 Volt Generators(made 1953-1965) look as your photo and are sealed front and rear of case . Your 12 Volt Gen. photo is a Car or Truck Generator which ALL HAVE FOUR SLOTS in the rear of the case . Original Ford Diesel Tractor 12 Volt Gen.(made from 1958-1965 , no diesels in the hundred series) have ONLY ONE SLOT in the rear of the case pointing downward . The bands are generally on REMANUFACTURED UNITS(because car, truck, and tractors are the same case design except the cooling slots) from Ford or many of the Brand Name Rebuilders to keep the water out of them when installed in Tractors or other Ford Industrial applications . THANKS TONY |
Are number of slots same for 20amp (2900450) and 25amp (B9NF-10002-A)? Both 12v units listed in FO-20.
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Tony Jacobs
Long Time User
Joined: 22 Sep 2007
Posts: 762
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| Posted: Wed Sep 26, 2012 3:40 pm Post subject: Re: 6 volt or 12 volt generator |
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Hello JMOR , Yes all tractors had just the one slot to keep the water out and let the heat out . Many Industrial units used truck generators with the truck rubber boot on the back of them to keep water out . Thanks Tony
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Larry NCKS
Tractor Guru
Joined: 23 Dec 2001
Posts: 3732
Location: Washington, KS/Lincoln, NE
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| Posted: Wed Sep 26, 2012 6:01 pm Post subject: Re: 6 volt or 12 volt generator |
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| RJSw/NAA wrote: | | (quoted from post at 09:55:32 09/25/12) I am Pulling some parts from a non running NAA to a still using 6 volt Jubilee. The NAA is definitely converted to 12 volt but the generator has three wires going from it and looks like the original, cast iron front. There are no numbers on it. Did older generators 6 and 12 both look the same? OR did whoever made this conversion leave the old 6 volt in? How do I tell what voltage a generator is? |
Here is a photo of a factory 6V from my '63 4000 gasoline tractor
You'll notice the only differences in appearance between it and the following factory 12V on my '64 4000 diesel is that it has a narrow band around its circumference near the back end and the diesel does not. The 12V diesel does have a cooling fan and one cooling slot on the bottom as Tony suggests. The 6V gasoline does not. 
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36 Coupe
Tractor Guru
Joined: 12 Mar 2010
Posts: 5874
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| Posted: Thu Oct 04, 2012 2:41 am Post subject: Re: 6 volt or 12 volt generator |
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Shabby looking fan belt and bare field wire touching generator frame.That must be your tractor..
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JMOR
Tractor Guru
Joined: 13 Aug 2007
Posts: 12793
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| Posted: Thu Oct 04, 2012 6:31 am Post subject: Re: 6 volt or 12 volt generator |
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| 36 coupe wrote: | | (quoted from post at 06:41:13 10/04/12) Shabby looking fan belt and bare field wire touching generator frame.That must be your tractor.. |
Nah! My remote satellite got a shot of yours! You are just lucky it still works, especially in your climate!
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