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Full Discharge on Ammeter?

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Alan R

09-15-2007 14:07:30




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A while back I attempted to polarize the generator on my 52 8N (sidemount) while it was running. Still kicking myself over that stupid move, which resulted in tractor immediately stalling and smoke coming form generator. Afterward, I removed the generator and it would not motor, so I took it apart, cleaned it up and put it back together since brushes and all looked fine. After reassembly, generator would motor over okay, so I put it back on. Then found I had no spark at points and traced lack of current to the ammeter, which I replaced today. New ammeter showed a very slight negative deflection when the key was turned on so I attempted to start the tractor. Tractor started right up, but died after about 10 seconds and I noticed the ammeter was at full discharge. Turning off the ignition had no effect, so I pulled a battery cable. I don't enjoy working on electrical problems, so am looking for some help (again) on what could be wrong. Voltage regulator? Generator? Any help appreciated. Thanks.

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soundguy

09-15-2007 22:00:53




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 Re: Full Discharge on Ammeter? in reply to Alan R, 09-15-2007 14:07:30  
My guess is you let the smoke out of the VR as well as the genny when you fiddled with it while running.

Typically.. unless you really know what you are doing, the 'full field' test is the only one you should do while running on an a-circuit system, unless you reasonably believe that the cutout is indeed bad.. etc..

If you have a spare vr.. put it on. polarize ( jump bat and arm ) and try her out.

Soundguy
Soundguy

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Alan R

09-16-2007 09:00:45




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 Re: Full Discharge on Ammeter? in reply to soundguy, 09-15-2007 22:00:53  

soundguy said: (quoted from post at 22:00:53 09/15/07) My guess is you let the smoke out of the VR as well as the genny when you fiddled with it while running.

Typically.. unless you really know what you are doing, the 'full field' test is the only one you should do while running on an a-circuit system, unless you reasonably believe that the cutout is indeed bad.. etc..

If you have a spare vr.. put it on. polarize ( jump bat and arm ) and try her out.

Soundguy

Soundguy


Obviously, I don't really know what I'm doing third party image I pulled the VR and removed the cover to find that one set of points had a small "thread" of melted metal fusing them together. I carefully removed the "thread" cleaned up the points and put the VR back on the tractor. Tractor started fine and ran for about 30 sec and stalled out. Ammeter did not show disharge, but didn't show charge either. I'll try polarizing (the right way) and see what happens, but I'm concerned the stalling may be a separate issue. Thanks for the help.

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thomas j kohanski

09-15-2007 18:39:48




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 different in reply to Alan R, 09-15-2007 14:07:30  
whats the differance between a 9n and a 2n?



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Dunk

09-15-2007 20:50:15




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 Re: different in reply to thomas j kohanski, 09-15-2007 18:39:48  
It will take someone a lot better at this than I am, but basically a 2N was the war model of the 9N, the model was changed to avoid some war time restrictions, ifn I remember correctly.



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Dunk

09-15-2007 15:39:08




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 Re: Full Discharge on Ammeter? in reply to Alan R, 09-15-2007 14:07:30  
My bet is the VR, but I am not really up on this stuff as I use a 6 volt positive ground Chevy alternator that I had special built by an alternator shop 20+ years ago.

You should be able to open and inspect the VR, even if you have to drill out the rivets, and put back sheet metal screws.



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Dunk

09-15-2007 15:40:23




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 Re: Full Discharge on Ammeter? in reply to Dunk, 09-15-2007 15:39:08  
Look for burned, stuck points, and burned windings on the wire coils.



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Alan R

09-15-2007 15:53:38




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 Re: Full Discharge on Ammeter? in reply to Dunk, 09-15-2007 15:40:23  
Thanks for the reply. If I can find my old VR, I may give that a try before cracking open the current one. A 6V alternator? Been on the job for 2o years? I need to find a friend like that.



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JerryCPP(WA)

09-15-2007 18:21:54




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 Re: Full Discharge on Ammeter? in reply to Alan R, 09-15-2007 15:53:38  
Any good parts store can supply you with a 6 volt alternator, but it will be negative ground. Not a problem for an 8N, just reverse the wires on the battery, coil and ammeter, and away you go. I've been running 6 volt one-wire alternators on my TO-20 and '48 GMC for years. An alternator is cheaper than a generator and regulator, if you're looking for function instead of looks.



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Dunk

09-15-2007 21:40:34




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 Re: Full Discharge on Ammeter? in reply to JerryCPP(WA), 09-15-2007 18:21:54  
And from my understanding, you loose 20% of yer spark, swapping the polarity..

Now correct me ifn I am wrong.



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JerryCPP(WA)

09-16-2007 13:17:33




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 Re: Full Discharge on Ammeter? in reply to Dunk, 09-15-2007 21:40:34  
I've never heard of that, but then again no one I know has a way to measure that kind of voltage. Also, I am far from an expert on anything electrical. The GMC was positive ground before the conversion, and I've had no problem with whatever spark it has. The TO-20 was negative ground to start with. Both still throw a good blue spark.



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