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Generator output

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polk crawler

02-24-2002 20:32:08




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Is there a way to check generator output without removing it from a machine? I get no evidence of it being alive as ammeter needle does not move when engine is operating. Thanks. PC




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Don Young

02-24-2002 22:04:12




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 Re: generator output in reply to polk crawler, 02-24-2002 20:32:08  
Use a voltmeter or test light to check for voltage at the generator output terminal. If you have a voltage regulator (two terminals on generator) the output terminal is probably larger and has a heavier wire. If the voltage at the output terminal is about the same as the battery, the generator is charging. You will also get a slight increase in battery voltage when the generator is charging (light gets brighter). Hope this helps.

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polk crawler

02-26-2002 16:00:26




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 Re: Re: generator output in reply to Don Young, 02-24-2002 22:04:12  
DON: Got only a 2V gen reading following your suggestion; system ius 6v with an 8v battery; following instructions from Steve on this posting, got no bette resuls; looks like a gen rebuild ahead; thanks for the suggestion and wish it had solved the problem. PC



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Tom H.

03-02-2002 17:48:44




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 Re: Re: Re: generator output in reply to polk crawler, 02-26-2002 16:00:26  
Before you try to rebuild your generator you might take out the brushes and clean the brush surface that contacts the commutator. Also you might try cleaning commutator surface with a small Dremel Tool and brush.



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polk crawler

02-26-2002 15:56:19




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 Re: Re: generator output in reply to Don Young, 02-24-2002 22:04:12  
DON: got only a 2V response measuring output as you suggested; system is 6 V using an 8V battery.
Reading and following Steve's instructions also on this posting and no differest test results looks like a gen rebuild is ahead. Thanks for the info; wish it had solved the problem PC



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steve

02-25-2002 19:27:26




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 Re: Re: generator output in reply to Don Young, 02-24-2002 22:04:12  
there are two terminals on the generator. "A" and "F". The "F" is the grounded terminal (can be psoitive or negative, depends on the tractor). -Measure the battery voltage. (6 or 12v)
-start tractor and measure the voltage between "A" and "F" on th egenerator, should be (7 or 13.5v) if low--
-remove the wire on "F" and add a jumper wire to ground the "F" terminal to the frame.
-start tractor and measure the voltage between "A" and "F". if it is not above battery voltage, the generator needs rebuilt.

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polk crawler

02-26-2002 15:51:10




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 Re: Re: Re: generator output in reply to steve, 02-25-2002 19:27:26  
Steve: followed your instructions; got only a 2V reading on the gen; batt is an 8V unit; entire system is 6 V; looks like a gen rebuild is ahead. Any guess what the rebuild $ will cost me? Where does the voltage regulator fit in the system? cleaned terminals good on it, looks like new under the cover,an Echlin if I recall; no manufacture tag on the gen on a '53 OC3, Hercules IXB3 engine. Thanks for the directons. PC

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steve

02-28-2002 20:16:07




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 Re: Re: Re: Re: generator output in reply to polk crawler, 02-26-2002 15:51:10  
the voltage regulator has three coils inside. they adjust voltage, adjust charge rate, and break the current flow to battery when motor is off. by shorting out the "F" terminal to ground you bypass one coil. by removeing the wire on the "A" and using a volt meter to ground you eliminate the second coil and test only the generator. I have taken several generators apart and found after 50 years it is common to have a bunch crud inside, heavy layer of corrosion on the copper rotor bars, and scale on the carbon brushes. i put a little sand paper to everything and turn the copper bar commutator down on the lathe if you have one. scrape the wire terminals and reassemble. so far it works almost every time. A rebuild will cost about $100. at electric motor shop.

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