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Generators..6 or 12 volt???

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AWB

12-20-2002 05:39:53




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Can the internal parts of a 6 volt generator be changed to be a 12 volt system. Would like to have a 12 volt generator to maintain original appearance, but the better 12 volt starting system. Thanks.




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Steve in N.J.

12-20-2002 11:30:24




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 Re: Generators..6 or 12 volt??? in reply to AWB, 12-20-2002 05:39:53  
AWB,
Some 6V generators can be converted to 12V with minimal changes, but there really isn't anything wrong with the 6V systems. One of the biggest problems for the 6V system in the starting department is bad or undersized wiring from age or "temporary fixes". Six volt systems rely on amperage for their reliability. The second is usually connections. Bad grounds, corrosion, and breaks in the circuitry all cause the headache. With new & correct size circuitry, a reliable battery, and all switches and gauges operating correctly, the OEM higher amp 6 volt system is very reliable. If the engine is in tune, and it's components are in good shape, it'll fire up every time, even in the dead of winter.... Steve B.

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L Hud

12-20-2002 11:26:08




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 Re: Generators..6 or 12 volt??? in reply to AWB, 12-20-2002 05:39:53  
The easiest convertion ,if your Allis has the original type light switch, is to install the 12v battery with pos ground. Place a resistor going to the distributor. The 6v generator will charge the 12v system. Replace the 6v bulbs in the lights with 12v bulbs. I have a couple Allis's running like this and has run for years. Hope this helps.



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Don

12-22-2002 18:04:09




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 Re: Re: Generators..6 or 12 volt??? in reply to L Hud, 12-20-2002 11:26:08  
When you change these systems over what do you do about the 6 v starter motor?



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steve

12-20-2002 15:00:03




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 Re: Re: Generators..6 or 12 volt??? in reply to L Hud, 12-20-2002 11:26:08  
most 6 volt generators will put out 12 volt, but longevity is the question. most tractors dont use much power, so pushing the generator to 12 volts works for quite some time, unless it is in poor conditino to start with. two ways to do it.
---you can have your generator rewound to 12 volt positive ground, or buy one for a 1958 chevy pickup, etc at AUTO ZONE. Then you connect a 12 volt voltage regulator ($20.)
---If you have a 6 volt generator, you can disconnect the battery and run the tractor, and measure the generator output between "A" and "F" terminals with the "F" grounded, and it will put out 15 volts, so it could be regulated to 12 easy enough. Problem is it is positive ground.
--I had my original generator rewound to 12 volt negative ground for $90. THen bought a WELLS regulator at Auto Zone for $20 and wired it up. PUt the regulator under the gas tank and you dont see it. Generator looks original, minus the cutout relay.

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Jerry

12-20-2002 16:31:53




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 Re: Re: Re: Generators..6 or 12 volt??? in reply to steve, 12-20-2002 15:00:03  
I have been told that their is two styles of 6 volt genaters. A two brush that needs a voltage regulater and a three brush that needs a cutout and a two position switch that cost close to $50.00. Am I right.



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steve

12-20-2002 18:20:05




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 Re: Re: Re: Re: Generators..6 or 12 volt??? in reply to Jerry, 12-20-2002 16:31:53  
there are two variations to the 6 volt generator, 2 brush and 3 brush. I dont think the voltage regulation is dependant on which type you have. All generators need some type of "regulator". A "regulator" is actually two or three magnet coils that do three things. One relay (coil) shuts the voltage off from the generator when the motor is not running. ONe relay adjusts the current output of the generator. One relay adjusts the voltage output of the generator. On a newer voltage regulator, normally a 12 vlot from the 1958-1975 era, all thee relays are in the same "box" and you will have 3 or 4 terminals for external wiring. On a 6 volt system the charge rate is very low, since no accessories except maybe a light or two. In the 1940-1955 era it was common to put one relay (voltage cutout) on the generator to shut off the power when the tractor is not running. The second relay was replaced by a resistor in the light switch. YOu charge at 3 amps with the lights off and 8 amps with the lights on, very simple, not adjustable. The third relay is eliminated in this simple system. I think you can buy a 6 vlot regulator, but the cutout and light switch resistor are very common in the 1940-era. If you need a diagram of any of the above, or more details, i can send one.

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Jerry

12-21-2002 07:56:59




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 Re: Re: Re: Re: Re: Generators..6 or 12 volt??? in reply to steve, 12-20-2002 18:20:05  
I just had my 6 volt two brush generator rebuilt and the man that rebuilt it claimed that a cutout would not work properly. He could be wrong. A cutout is sure less expensive.



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steve

12-21-2002 15:46:02




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 Re: Re: Re: Re: Re: Re: Generators..6 or 12 volt??? in reply to Jerry, 12-21-2002 07:56:59  
a two brush generator is a newer model than a 3 brush. eliminating the third brush and putting an extra relay in a "voltage regulator" allowed a better current regulation than using the old light switch as an "on off". If you have a two brush generator you should use the newer regulator.----- -look at the "articles" to the left of this page under "RESEARCH", then look at "two brush generator". some good reading.

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