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JD A 6 volt to 12 volt conversion

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Gale Mausolf

11-10-2000 11:59:13




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I have a '46 A with a 6 volt positive ground system that I would like to change to 12 volt. I know the starter will handle it for short periods but what do I need to change in the charging system? It has a mag so will the ignition system be OK? Also, should I change it to negative ground or leave it positive ground?
Thanks,
Gale




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John T (Just change the Regulator)

11-12-2000 05:59:39




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 Re: JD A 6 volt to 12 volt conversion in reply to Gale Mausolf, 11-10-2000 11:59:13  
Gale, as Ol Burl there stated, I would just install a new 12 volt battery positive grounded, buy a 12 volt regulator, install and wire it to the existing generator, polarize it, change any light bulbs to 12 volts, and the mag is fine no changes needed. A Generator doesnt know what voltage it is, thats increased by turning it faster or running more field current through it. While a 6 volt or 12 volt generator may have slightly different field and armature windings, I have changed many over as I said and NEVER had one go bad yet. If youre a perfectionist you would have to go to Kens Classic Generator and get diferent field coils etc., but I think changing the VR will last for years, maybe as long as a total proper conversion. An Old Engineer from Indiana, John T

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Burl

11-10-2000 17:52:46




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 Re: JD A 6 volt to 12 volt conversion in reply to Gale Mausolf, 11-10-2000 11:59:13  
On my 49 B, all I did was put on a 12V regulator. The 6V generator handles it just fine. Before I did this I did the following test. I grounded the F terminal of the generator momentarily while a voltmeter was connected between the A terminal and ground. The generator put out 31 Volts! Someone a long time ago (probably an old engineer from Indiana) had suggested that the 6V gen would put out 12 volts, and by golly he was right! Had to do the old test and verify it myself, though. As far as the magneto, it's a separate system, and will be fine as it is. I kept my B + ground, just to avoid any unnecessary confusion. Will using a 12V reg affect the long term life of the 6V gen? Beats me.

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G Taylor

11-11-2000 06:19:33




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 Re: Re: JD A 6 volt to 12 volt conversion in reply to Burl, 11-10-2000 17:52:46  
While a neat & tidy 6 to 12 conversion with a generator hardly upsets me anymore, a butcher job with an alternator,dangling wiring and black electrical tape electrical connections still do. While a few conversions are done to allow better modern 12V halagon lights or to run equipment monitors etc. Most are to cover up starting problems from gummed carburators,low compression, oil fouling, old fuel, weak ignitions, and high resistance paths to & from the starter, or a low battery from putting around,start/stop operation at parades etc. Eventualy the tractor won't start on 12V either unless the problems are solved. Figure out what suits your situation best & enjoy.

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JimA TX

11-11-2000 13:00:54




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 Re: Re: Re: JD A 6 volt to 12 volt conversion in reply to G Taylor, 11-11-2000 06:19:33  
If the tractor is to be used for work and not show changing the system to a 12 volt system is the logical thing to do. You can add a AC alternator with the regulator built in and go with negative ground. All you will have to change on the tractor is the light bulbs. Mine is this way and definately NOT trashy looking. I use it around my place for mowing, disk, blade what the tractor was made for. Show guys have to have everything origional. Save your generator in case you want to make it a show tractor or later on sell it.

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