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Discussion Forum

How do I test my generator, Battery not charging

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Rick from Paso

02-20-2001 23:19:07

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My battery isn't being charged on my Case 310B, I have to pull it off and put a charger on it every so often. I put an ammeter on between the regulator and the battery, shows nothing. I am beginning to suspect the generator. How should I use a VOM to test the generator output? What should I disconnect when performing this measurement? Thanks for your help!

Regards, Rick from Paso.

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02-21-2001 05:54:55

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 Re: How do I test my generator, Battery not charging in reply to Rick from Paso, 02-20-2001 23:19:07  
You can "hotwire" your generator to test it.

Put your tractor in fast idle (generators don't charge at low RPM)

There should be two connections on your generator. Find the one that goes to your battery and ground the other one.

Your generator should be charging at it's full capacity. You should hear it take a load and you should be able to see the voltage increase with a voltmeter.

This is a temporary test and not a fix. If you leave this setup, you will fry your battery. A few minutes won't hurt but constant charging will.

Good luck.

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David Stocking

02-21-2001 10:34:54

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 Re: Re: How do I test my generator, Battery not charging in reply to Tyler(WA), 02-21-2001 05:54:55  
uhook the arm. and field terminal. ground the field terminal start machine put voltmeter on arm. terminal to check output of gen.this will tell if gen. is okay.if it is then check regulator fuses and wiring

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Al English

02-21-2001 12:19:46

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 Re: Re: Re: How do I test my generator, Battery not charging in reply to David Stocking, 02-21-2001 10:34:54  
Hi David, Sorry, but I'm afraid I have to go with Tyler on this one. Testing the output of the generator with no load(battery) doesn't tell you much. A bad generator might easily have enough output to power the voltmeter, but be completely incapable of any meaningful output under load. You have the right idea, but do the test with the armature wire connected...Al English

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David Stocking

02-21-2001 13:01:49

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 Re: Re: Re: Re: How do I test my generator, Battery not charging in reply to Al English, 02-21-2001 12:19:46  
Hi Al
I have had times when a wire was shorted to ground and could not get a reading with arm. wire hooked up. checked gen. and then checked rest of system

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02-21-2001 02:49:59

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 Re: How do I test my generator, Battery not charging in reply to Rick from Paso, 02-20-2001 23:19:07  
Quick one Rick, with the machine running, simply put a voltmeter across the battery terminals. You should get between 13.8 to 14.2 volts. It is as simple as that.
If you are not getting volts, it could be several things, such as generator/alternator, regulator, or even fuses etc or connections. Is your machine on a generator or alternator?
All the best,


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02-21-2001 22:19:40

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 Re: Re: How do I test my generator, Battery not charging in reply to Rex, 02-21-2001 02:49:59  
Whoa Rex,
A lot of our equipment is six volt not twelve so we will see 6.9 to 7.1 volts.

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02-22-2001 02:39:59

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 Re: Re: Re: How do I test my generator, Battery not charging in reply to John, 02-21-2001 22:19:40  
Apollogies, I guess after so long I forgot! I have not worked on a 6 volt system for many years. Tell you the truth, last time I set up a generator/regulator, I had to go find an old service manual to find the settings!

All the best,

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