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Testing the charging system

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aaron

02-02-2003 12:55:40




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how can i test the generator on a ford 3000 to see if its charging?




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aaron

02-02-2003 20:20:25




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 Re: testing the charging system in reply to aaron, 02-02-2003 12:55:40  
one thing i forgot to mention is that it is a diesel, if that makes a diffrence.



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Hugh

02-02-2003 15:24:51




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 Re: testing the charging system in reply to aaron, 02-02-2003 12:55:40  
Aaron, another way to do it is this: Make sure the fan belt is tensioned properly and make sure the generator connections are clean. You should check all other connections going to the voltage regulator, etc. If they are all good, disconnect the wires from the generator terminals and connect a jumper wire across the two terminals. Crank and run the engine at idle speed. Connect a voltmeter positive lead to one of the terminals and ground the other lead on the generator frame. Slowly increase the engine speed while watching the voltmeter. The voltmeter should rise quickly and without fluctuation but don't let it go over 20 volts. If it rises steadily to about the 20 volts the generator is charging. If not it needs repair.

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David Donaldson

02-02-2003 13:32:57




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 Re: testing the charging system in reply to aaron, 02-02-2003 12:55:40  
I asked a mechanic and he said, check the voltage before and after starting. The voltage will drop from the drain of starting, if it immediately goes back up, you are charging. The other test is to disconnect the battery after starting, if she keeps running, it is charging.



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Lizrad

06-08-2004 13:19:49




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 Re: Re: testing the charging system in reply to David Donaldson, 02-02-2003 13:32:57  
The idea of disconecting the battery after the tractor is running to test the generator (or alternator)would only apply to a gasoline engine. A diesel engine does not use "spark" or electricity to run...just the heat generated from the compression in the chamber causes combusion in a diesel.



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Bern

02-02-2003 15:20:26




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 Re: Re: testing the charging system in reply to David Donaldson, 02-02-2003 13:32:57  
Battery voltage will go back up immediately after starting whether or not it is charging. What you're looking for is to see whether or not the voltage rises above that which it was before you started the engine.

Example #1:

Voltage before starting: 12.6
Voltage during cranking: 10.8
Voltage after engine fires: 13.5
Conclusion: system is charging.


Example #2:

Voltage before starting: 12.6
Voltage during cranking: 10.8
Voltage after engine fires: 11.9 max
Conclusion: system is not charging

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