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Generator / Voltage Regulator Questions

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Dan K.(WI)

07-31-2001 19:20:54




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I recently acquired a '63 JD 1010 gas tractor. The generator looks brand new. It does not have an ammeter, just a GEN light. How can I tell if the generator has been polorized? Will it hurt if I polorize it again? Do I have to polorize it whenever I disconnect the battery? When are the times that I HAVE to polorize it? I have a new battery but it won't stay charged. I have to jump it to start it. One of the copper coils on the voltage regulator is a nice copper color, the varnish coating on the other one is all black and crusty like it's been fried. Should I replace the voltage regulator? Thanks in advance for any help you can give me. :)

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John T

08-01-2001 06:35:04




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 Re: Generator / Voltage Regulator Questions in reply to Dan K.(WI), 07-31-2001 19:20:54  
Dan, So when the tractor is at a fast RPM, does the idiot light go on or off???? Does it ever go on or off???? If its on but then goes off as tractor revs up, the gen and VR are likely working. Be sure the VR and Gen have good grounds, try grounding field winding and see if it makes the idiot light go off (if so a bad VR or bad VR ground). The tracotr if equipped with a generator, would have come out from the factory as pos grnd. Let us know what the idiot lght is doing and try grounding the field adn let us know. The VR may be fried however as the other gents said. Ol John T in Indiana

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Gman

08-01-2001 20:22:05




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 Re: Re: Generator / Voltage Regulator Questions in reply to John T, 08-01-2001 06:35:04  
Hello John T. glad to see your post,didn't make to Expo in Michigan lazy I guess,top of the day to you. Gman (garland)



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John T , good to have you back

08-01-2001 11:34:11




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 Re: Re: Generator / Voltage Regulator Questions in reply to John T, 08-01-2001 06:35:04  
John T. Good to see you back, though you had fallen off the face of the earth or something.



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Dan K.(WI)

08-01-2001 06:52:01




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 Re: Re: Generator / Voltage Regulator Questions in reply to John T, 08-01-2001 06:35:04  
The light stays on for about 10 seconds when I start the tractor. That is at low RPM. When I increase the RPM, the light goes out. Yes, it is positive ground.



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clooney

08-01-2001 04:09:09




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 Re: Generator / Voltage Regulator Questions in reply to Dan K.(WI), 07-31-2001 19:20:54  
Dan, you should polarize a generator when ever a new generator is installed, when ever the system polarity is changed (i.e., pos ground to neg ground), if there is a question of the existing polarity of the system, if the tractor is jump started using the wrong polarity, if the generator hasn't been used in years, when a new regulator is installed (polarization has nothing to due with the regulator but if it is wrong can fry a new regulator). It doesn't hurt to polarize a generator at any time & if in doubt at all about the system or polarity, polarize it. As Glen said it sounds like the regulator is fried but you never know I have seen them be as black as coal inside & still function. To properly polarize that generator, make sure the battery is charged in the correct polarity, then ground the F (fld) post on the generator & momentarily connect battery voltage to the ARM post of the generator.

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JeffS

11-21-2001 06:35:39




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 Re: Re: Generator / Voltage Regulator Questions in reply to clooney, 08-01-2001 04:09:09  
DOES THE FOLLOWING APPLY TO 12V NEG GROUNDED SYSTEM? SOMEONE IS TELLING ME THE MOTOR MUST BE RUNNING WHEN DOING THIS.
To properly polarize that generator, make sure the battery is charged in the correct polarity, then ground the F (fld) post on the generator & momentarily connect battery voltage to the ARM post of the generator



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andy b.

08-01-2001 19:32:50




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 Re: Re: Generator / Voltage Regulator Questions in reply to clooney, 08-01-2001 04:09:09  
okay, i'm still new to this. i have a 1954 40U that i'm working on. i took the generator apart and cleaned and put it back together with new brushes and springs. there were no opens in the field or armature windings, but i really can't tell if there are any shorts.
anyway, i always see mention of polarizing the generators after doing major work on them. when you folks say to ground the F (field) post, does that mean to connect it to the positive 6V battery terminal (since the tractor has a positive 6V ground), or does ground mean the "standard" ground we think of on the negative terminal?

since my 40U isn't running at the present, i'm trying to test the generator on the bench somehow, and want to use a battery to polarize it.

any tips are appreciated.

andy b.

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Clooney

08-02-2001 02:38:38




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 Re: Re: Re: Generator / Voltage Regulator Questions in reply to andy b., 08-01-2001 19:32:50  
Andy, if you are polarizing to a positive ground then yes the F (fld) post goes to positive. I usually just hook a jumper from the F post to the generator frame then clamp a jumper cable from the pos post of the battery to the generator frame & momentairly touch a jumper cable from the negitive post of the battery to the ARM post of the generator. The generator should motor if it isn't hooked to the fan belt & if the F post is un-rounded the mototing speed should speed up. If that doesn't happen then the generator has a problem.

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G Taylor

07-31-2001 19:52:18




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 Re: Generator / Voltage Regulator Questions in reply to Dan K.(WI), 07-31-2001 19:20:54  
Polarizing just means energizing the armature & field briefly to ensure the residual magnetism in the iron has the same polarity as when operational. Otherwise the generator will not build voltage. Once is enough. Sounds like the voltage regulator is ruined.



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