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Re: Perplexing alternator problem

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Author  [Modern View]

05-08-2013 14:06:28

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Quoting Removed, click Modern View to seeFind another parts supplier. You can connect a voltmeter directly across the battery. If vehicle hasn't been run recently, the voltage will be approximately 12.3 volts. Then you start it, run at speed for a few minutes as you watch the voltage on your voltmeter climb a volt or more. No climb = no alternator output.

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05-08-2013 14:13:48

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 Re: Perplexing alternator problem in reply to JMOR, 05-08-2013 14:06:28  
I did that at the onset of problem. Voltage read 12.38 from battery without tractor running. After starting, checked voltage at battery post on alternator. Still read 12.38 volts.

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05-08-2013 14:23:01

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 Re: Perplexing alternator problem in reply to Greg1959, 05-08-2013 14:13:48  
Quoting Removed, click Modern View to see No climb = no alternator output. Alt not working.

You can do another test, but unless you are just curious or want to dig into the alt internals, it isn't worth much. It tells you whether the problem is the VR or some other area of the alternator. On the back side of alt is a "D" shaped hole. Inside that hole is a small metal tab. When a screwdriver is inserted & touches tab, it shorts that tab to the side of the "D" hole and this will provide full field current and if all else is well the alternator will output its maximum.


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05-08-2013 14:42:43

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 Re: Perplexing alternator problem in reply to JMOR, 05-08-2013 14:23:01  

That's interesting information.


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