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Farmall & IHC Tractors Discussion Forum
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Regulator Failures

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NJRon

09-10-2005 05:04:29




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I have a Farmall 350 on which the voltage regulator seems to fail on a regular basis. After a while the ammeter no longer shows charging.

The instruction sheet that came with one of the regulators has a series of tests using s jumper wire to find out if the regulator is bad. One of these checks is to connect the jumper between the FIELD terminal and ground. If this increases the charge rate, the regulator is bad. When I do this test the ammeter shows charging. This is the same check I do every time the regulator fails.

I'm stumped as to what could be causing this. Does the fact that the tractor is outdoors have something to do with it? Any help would be appreciated.

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Dave in CT

09-10-2005 12:31:39




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 Re: Regulator Failures in reply to NJRon, 09-10-2005 05:04:29  
Here's the link:



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Dave in CT

09-10-2005 11:13:03




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 Re: Regulator Failures in reply to NJRon, 09-10-2005 05:04:29  
I agree with the posts that recommend cleaning grounds and reg points. To clean the grounds outside of the reg you can use the standard wire brush routine. This may be a bit overfastidious to some but, I learned from an electrical engineer, to clean points on a regulator or electric motor, use crocus cloth - a fine clay abrasive that will leave your points as smooth as they should be. Also, electrical contact cleaner is good for removing corrosion on points - the best deal I've found on it is a spray paint sized can of CRC from Home Depot. I would imagine your tests mimic this flow chart but check out Bob Melville's Gererator/Regulator Troubleshooting Flow Chart. I don't have the link handy but do a google search for "Bob Melville's Wiring Diagrams" and follow the Epson Photo Center link.

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the tractor vet

09-10-2005 06:51:09




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 Re: Regulator Failures in reply to NJRon, 09-10-2005 05:04:29  
Some times i have found that with tractors that set outside it is not the reg but the grounding problem and when you change the reg you just made a new ground so before you by a new reg. i would clean all grounds and see what happens and sometimes the points in the reg. get corroieded and it will not charge , i go thru this on the 720 JD about twice a year and about every other year we have to replace the reg.

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NJRon

09-11-2005 05:06:26




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 Re: Regulator Failures in reply to the tractor vet, 09-10-2005 06:51:09  
Thanks for all the suggestions.

When the tractor is running the ammeter always shows a slight discharge which increases when I turn the lights on. After using it for some time (without lights) have have to put a battery charger on it.

I tend to agree with the Tractor Vet in that the contact points may become corroded.

At any rate I have another new regulator on order and we'll see what happens.

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holcombwa

09-10-2005 06:46:20




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 Re: Regulator Failures in reply to NJRon, 09-10-2005 05:04:29  
Hmmmm.... After fixing up the charging system on our Farmall A, was very frustrated that the gauge indicated no juice from the generator. Had the generator tested at local Napa and they said it didn't work. Nebraska Cowboy suggested on here that he had jumped field to ground before to get them working. Tried it last night and it worked and kept working. Don't know why it works, but it started following the charging pattern everyone here says they should, AND kept doing it when shut off and restarted several times (without having to jump field to ground any more). For what it's worth, I would go along with Allen and say the regulator is probably ok (mine was a brand new one), and it's something else that cuases them to charge after the fields grounded. Now if someone on here could explain what is happening to cause it to work, that would be great. I'm not a big fan of mysteries.
Stan

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Janicholson

09-10-2005 22:08:17




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 Re: Regulator Failures in reply to holcombwa, 09-10-2005 06:46:20  
Search Archives for--- Polarizing Generators---, recient posts piont the way.
JimN



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Allan in NE

09-10-2005 05:31:17




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 Re: Regulator Failures in reply to NJRon, 09-10-2005 05:04:29  
NJR,

I wouldn't be too hasty to condem that system as ammeters work differently than voltmeters.

If the gauge is reading "0" or just to the right of "0" amps, that just means that the battery is full. After you start the tractor, the meter should show charge for a bit, then drop back towards center.

If your battery isn't going dead, I think your tractor is plumb normal.

Allan



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