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John Deere Tractors Discussion Forum

3020 batteries and charging systems

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11-15-2006 17:17:48

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Can someone briefly explain the battery/charging system on early vs. late model 3020 diesels (i.e. serial #123000 being the dividing line in 1969)? I gather the early models were 24 volt systems with a generator. Was that two 12 volt batteries wired together? If so, how? Series or parallel? Then did they switch to alternators and two 12 volt batteries in '69?

Can a battery maintainer (ex. batterytender.com) be used on both early and late style systems? If so, how does the hook-up differ? Do you have to charge one battery at a time or can you do both batteries at once and just leave the maintainer plugged in all the time? Is there any way to charge them both batteries via the cigarette lighter? Sorry for all the questions. I'm new to two battery set-ups and I'd like a tractor that starts in cold weather. Thanks.

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11-15-2006 20:43:11

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 Re: 3020 batteries and charging systems in reply to sodly, 11-15-2006 17:17:48  
Early models used 2-12 volt batteries wired in series and used a 24 volt generator unless it has been converted over to a 12 volt system with an alternator.You would have to use two battery minders--one on each battery if it still is a 24 volt system.Bob will probably disagree , but I think switching a 24 volt system to a 12 volt system is a very good move.Generators don't kick out much of a charge if the tractor idles a lot.Alternators do much better than generators at idle speeds.
The late model could have 2-6 volt batteries wired in a series or 2-12 volt batteries wired in parallel depending on the tractor's history and who owned it.Either way would work and one battery minder would suffice.The later model was equipped with an alternator from the factory.

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11-16-2006 09:08:58

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 Re: 3020 batteries and charging systems in reply to msb, 11-15-2006 20:43:11  
Thanks for the information. How would a person go about jump starting the various arrangements?

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11-16-2006 18:19:24

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 Re: 3020 batteries and charging systems in reply to sodly, 11-16-2006 09:08:58  
Same way you would charge the batteries.You are welcome,bob.

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