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Generator output voltage

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Puzzled in Pa.

11-09-1999 10:17:07




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The rebuilt 3 brush generator I bought was putting out 10 amps And overcharging my battery. But in the process of troubleshooting the problem I noticed that when I put a digital voltmeter on it's output terimal the meter just gives jumbled numbers, not a steady voltage. Same thing at the battery also. I tried putting the Meter in the amps function in series with the gen and it's wire and it did the same thing also. Do these generators put out pulsating DC that wouldn't read on a digital voltmeter since there is no voltage regulator on it or is there something wrong with it? I know it's putting out something because it was charging 10 amps.(adjustment screw wasn't working) and boiling the battery. What do you think guys?

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Claus

11-09-1999 11:55:36




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 Re: Generator output voltage in reply to Puzzled in Pa., 11-09-1999 10:17:07  
The generator puts out overlapping sinusoidal waveforms. The erratic movement is probably brush hash.. This should not be especially at the battery, since the battery acts like a umongus electrolytic capacitor. You may have a poor ground connection(s) at your generator or other return path to the battery. This should not bother anything. You have discovered one of the downsides of digital meters. Erratic movememt renders them difficult to read. I keep an analog meter in such cases. Good that you found your problem with the third brush.
Happy Motoring
Claus

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To....Claus

11-09-1999 14:04:03




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 Re: Re: Generator output voltage in reply to Claus, 11-09-1999 11:55:36  
I have the same overcharging problem with my 2n. I have not had the time to take it apart, but with winter here (who says there's global warming !) I plan to take apart the generator this winter. I guess I'm looking for the 3rd brush adjustment, but what exactly do I look for ? When I take the back off, will things go "boing" with springs etc. flying all over ? I've looked in my FO-4 manual, but it doesn't give a clear picture of the break down. What should I be careful of ? TimK

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Claus

11-09-1999 15:21:25




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 Re: Re: Re: Generator output voltage in reply to To....Claus, 11-09-1999 14:04:03  
Well, starting with the 8N, a voltage regulator was employed to prevent overcharging. Unfortunately the 2/9N do not have this luxury. There should be (If my memory serves me) a little hole in the back of the generator with an arrow showing the direction to turn the 3rd brush... Even at the lowest setting, if the tractor is run a lot, it could overcharge the battery. If you have lights you may put them on to "eat" some extra current. If you take the back off, the brushes will fully extend but will not go flying in all directions. When reinstalling the back plate, you need to compress the brushes with your fingers so they will slide over the commutator. Even with my fat fingers I could do it. An impact wrench (If you have one) is the best way to remove the front pulley nut rather than sticking the armature in a vise. Happy Motoring
Claus

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