Kubota charging problem

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  #1  
Old 03-12-10, 04:02 PM
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Kubota charging problem

I have a early 80's 7200 Kubota 1620 3 cyl diesel. The charging light remains on. I checked the output at the battery with a voltage tester. At 1/2 throttle I'm measuring 12 volts. I've been told it should be higher when the engine is revving to half throttle. Somewhere above 13. Where would you look for the problem? Dynamo or voltage regulator?
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Old 03-13-10, 10:26 AM
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Not a Kubota person, but check wiring and cables, then the voltage regulator.
 
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Old 03-14-10, 01:46 AM
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Doesn't that have a small belt-driven alternator?
 
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Old 03-14-10, 08:38 AM
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Kubota charging problem

It has a small belt driven dynamo it's called. I checked the dynamo output and it is putting out 27 volts AC. The output should be at least 25 volts, so I am led to believe it must be the Voltage regulator that is bad.
 
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Old 03-14-10, 07:05 PM
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Do you have to jump start the engine, or does the battery charge enough to crank it up? If you have to jump it, then the battery could be internally shorted and consuming the amperage produced by the charging system. If the battery is good and charged, then check the dynamo output voltage right where the wire enters the regulator. If it is still 27 volts, then check the regulator output right at the wire where it exits the regulator. If it is below 13 volts, I suspect the regulator is bad as well.
 
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