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3020 24v Electrical Problems

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Josiah

04-08-2002 11:37:29




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I am learning and working on a 3020 for a friend, where the batteries like to go dead. I have a strong automotive background, but have no clue what is going on in the 24V system. I have checked the voltage across the batteries (both in series) when charging. I am only reading a bit over 24 volts. Whenever I try to start the tractor, after sitting all week, each battery is only reading 12 volts (versus ~12.66V). I think the generator is not charging the batteries up, but I am not certain what exactly I should be checking. Could you please tell me some things to check in order to isolate my problem. Should I actually be getting 24 volts (or rather 26+ volts) from the generator?

Also, this tractor is wired with a jumper from one battery to the next (they are not linked through the frame). Is this a problem?

Thank you very much for any information you could share with me.

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Perry Gorrell

04-08-2002 14:41:32




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 Re: 3020 24v Electrical Problems in reply to Josiah, 04-08-2002 11:37:29  
The problem is very simple to find out. Un hook your batteries and charge them fully. If the right battery sparks when hooking it back to the positive, then the starter has a short in it, if it does not, the generator is shorting out. Usually if it is the starter, only the right side battery will drain.



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Gord

04-08-2002 12:15:52




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 Re: 3020 24v Electrical Problems in reply to Josiah, 04-08-2002 11:37:29  
The generator should put out between 26 to 27.5 Volts when running. The crossover cable was used between the two batteries to replace the short cables to the tractor frame. There should be a fused wire between the positive end of the crossover cable to ground with a 30 amp fuse. The batteries may be going dead because of a ground in the starter(usually), wiring harnesses or in the generator. With the tractor shut off-use a voltmeter and connect to the positive end of the battery crossover and to ground to check for voltage. There should be less than one volt indicated. If there is more than one volt-start removing connections from the starter, generator, key switch and light switch to isolate the short. Let me know what you find.

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Josiah

04-23-2002 10:39:29




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 Re: Re: 3020 24v Electrical Problems in reply to Gord, 04-08-2002 12:15:52  
There was only about 0.1 Volt between the crossover cable and the ground. The tractor has been sitting for a few weeks (because now the radiator is leaking bad also). Anywho, the batteries are not going dead. They are staying at the level where I charged them to last. The tractor starts, but everytime I run it, the batteries go a little lower. I am only getting a click over 24 volts at the batteries when the tractor is running.

How do I check if the lack of charge is due to the voltage regulator or the generator? Can you explain which wires I should be taking readings off of to check the generator output? I guess basically, the issue is now clear that the batteries were only going dead because they were not getting charged up by the generator. What step should I take from here?

Thanks for your help. - Josiah

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