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Massey Harris & Massey Ferguson Tractors Discussion Forum
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testing generators

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jerry

07-10-2004 07:26:05




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how do you test a generator to see if it is charging properly.using a volt/ohm meter,just installed new brushes h260 motor 44rc still not sure if working right.




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Thomas

07-11-2004 14:08:07




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 Re: testing generators in reply to jerry, 07-10-2004 07:26:05  
I've always found that if you connect the two terminals on the dynamo to the battery and earth the case, it will run like a motor if OK. (obviously don't do this with the fan belt on, preferably off the vehicle). If it then fails to charge, chances are the regulator is at fault.



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Chip S.

07-11-2004 06:01:10




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 Re: testing generators in reply to jerry, 07-10-2004 07:26:05  
Like Allan said, but if the voltage doesn't come up, it may be a bad regulator. With the voltmeter attached, momentarily ground the field post on the genny. If the voltage shoots up, your regulator is bad.



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Allan C.

07-10-2004 20:50:15




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 Re: testing generators in reply to jerry, 07-10-2004 07:26:05  
To test a generator properly you need a volt meter and an amp meter. But.. if you only have a volt meter and it's a 6 volt , check the battery voltage before starting the engine. it should read a little over 6 volts, like 6.5. Start the engine and run at a fast idle, the voltage should come up to around 7.5 if it's charging. it may take a minute or so, if the starter took long.



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