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Discussion Forum
:

I Am Still Confused About 12 Volt Generator Conversion

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cheg

01-20-2002 16:22:52




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What is changed on the inside of a 6-volt generator to make it 12 volt?

From what I read, to get a voltage conversion, you change the 6-volt regulator to a 12-volt regulator. This means to not touch the generator. Is this correct? I have been told I had to take my generator to a shop for the 12-volt conversion process.




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confused

01-21-2002 19:46:34




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 Re: I Am Still Confused About 12 Volt Generator Conversion in reply to cheg, 01-20-2002 16:22:52  
Now your more confused than when you started.



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ohiobill

01-21-2002 12:24:27




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 Re: I Am Still Confused About 12 Volt Generator Conversion in reply to cheg, 01-20-2002 16:22:52  
If you get a used 12 Volt Altenator off a car, be sure to replace the hi speed cut in switch with a low speed switch or it will not charge the battery at low rpm.



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Bob M

01-20-2002 18:38:27




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 Re: I Am Still Confused About 12 Volt Generator Conversion in reply to cheg, 01-20-2002 16:22:52  
You can stick a 12 volt regulator on a 6 volt generator and get 12 volts. This is because a generator acts as a "current source" (not a "voltage source"), and is capable of delivering current at a terminal voltage of 20 - 25 volts or so. However a 6 volt generator running on 12 volts will tend to run hot under full-field (i.e. heavy load) conditions. This is because 12 volts doubles the design current flowing in the field windings, which in turn QUADRUPLES the heat dissipated in windings (P = I^2 * R). Bottom line is a 6 volt generator will work on 12 volts, but depending on the application may not last for long. A true conversion of a generator from 6 to 12 volts involves rewinding the field coils with smaller, higher resistance wire to keep the field current (hence heat dissipation) within design limits.

Regarding alternators that will fit under the hood of a "M", there's room up there for most any standard automotive alternator. Only certain older, "high output" (usually 70 amps and above) units, and the older Chrysler externally finned alternators are too big to fit.

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cheg

01-20-2002 17:53:42




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 Re: I Am Still Confused About 12 Volt Generator Conversion in reply to cheg, 01-20-2002 16:22:52  
I am concerned about an alternator not fitting under the hood. The 12 volt regulator would be the simplest. I was under the impression that a generator is a generator. The regulator tells the generator what voltage to produce.

Does anybody know of a simple alternator that will fit under the hood of an "M"?



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Carp

01-21-2002 09:10:46




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 Re: Re: I Am Still Confused About 12 Volt Generator Conversion in reply to cheg, 01-20-2002 17:53:42  
My M has a delco alternator on it. It is simple to hook up as well.



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Carp

01-20-2002 16:57:53




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 Re: I Am Still Confused About 12 Volt Generator Conversion in reply to cheg, 01-20-2002 16:22:52  
If you don't mind putting on an alternator that is the best way to go. I paid 39 dollars of the one on my 450 this week and you don't need a regulator.



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Steve R

01-20-2002 16:45:58




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 Re: I Am Still Confused About 12 Volt Generator Conversion in reply to cheg, 01-20-2002 16:22:52  
Your voltage regulator and generator have to be of the same voltage.You will have to get a 12 volt generator or have yours converted.



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Irv

01-20-2002 17:00:10




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 Re: Re: I Am Still Confused About 12 Volt Generator Conversion in reply to Steve R, 01-20-2002 16:45:58  
I thought the same thing, until I read some posts on this forum. The generator it seems is a generator, it doesn't know anything about voltage. The regulator does just that. I converted my H by putting on a new regulator, and changeing the bulbs, etc. The question I have is why alternators replaced generators? I am sure somebody here knows. Irv



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Jim T

01-20-2002 17:08:23




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 Re: Re: Re: I Am Still Confused About 12 Volt Generator Conversion in reply to Irv, 01-20-2002 17:00:10  
Irv, the biggest advantage of the alt. over the gen. is the alt. puts out max. voltage at all RPM while the gen. must be at max. RPM for max. voltage. Idleing your tractor with a gen. will not recharge your battery where an alt. will. Jim T



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C.George

01-20-2002 18:58:43




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 Re: Re: Re: Re: I Am Still Confused About 12 Volt Generator Conversion in reply to Jim T, 01-20-2002 17:08:23  
Jim, Also an alt.will have much longer brush life as they have a continous slip ring vs. a segmented communtator on a generator.Also they are so much more trouble free compaired to gen./reg. set up



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